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8.","difficulty":1,"difficultyBand":"easy","totalMarks":2,"sourceTitle":"Systematic Listing","calculatorUse":"non_calc","isCalculation":false,"parts":[{"id":"f7332cc6-13ed-489c-82f8-d32969081bf5","label":"","content":"Write down all the possible **two-digit numbers** that can be made using the cards.","markscheme":"- 52, 58, 25, 28, 85, 82\n\nAward 1 mark for at least 3 correct numbers. M1\nAward 2 marks for all 6 correct numbers. A1","marks":2,"order":0,"markingRubric":{"totalMarks":2,"points":[{"id":"p1","marks":1,"description":"Lists at least 3 correct two-digit numbers.","code":"M"},{"id":"p2","marks":1,"description":"Lists all 6 correct two-digit numbers.","code":"A"}],"finalAnswers":[],"generatedAt":"2026-05-05T10:23:57.594Z","modelVersion":"gemini-3-flash-preview"},"tableImages":[],"explanation":{"methods":[{"id":"systematic_listing","label":"Systematic listing","steps":[{"type":"text","order":0,"title":"Choose the tens card","content":"Work systematically by fixing the **tens digit** first. Each card can be used only once in a number, so after choosing the tens card, choose the units card from either of the other cards.","highlights":[{"text":"three number cards: 5, 2, 8","location":"specification"},{"text":"**two-digit numbers**","location":"specification"}]},{"type":"text","order":1,"title":"Start with five","content":"Put $5$ in the tens place. The units digit can be $2$ or $8$, giving\n\n$$52,\\ 58$$"},{"type":"text","order":2,"title":"Start with two","content":"Now put $2$ in the tens place. The units digit can be $5$ or $8$, giving\n\n$$25,\\ 28$$\n\nYou now have at least three correct numbers, so this is enough for the first mark, $\\mathrm{M1}$."},{"type":"text","order":3,"title":"Start with eight","content":"Finally, put $8$ in the tens place. The units digit can be $5$ or $2$, giving\n\n$$85,\\ 82$$"},{"type":"text","order":4,"title":"Check the complete list","content":"The complete list is\n\n$$\\boxed{52,\\ 58,\\ 25,\\ 28,\\ 85,\\ 82}$$\n\nThere are two numbers beginning with each of the three cards, so none have been missed. All six correct numbers earn the second mark, $\\mathrm{A1}$."}]}],"generatedAt":"2026-07-19T07:07:28.233Z","modelVersion":"gpt-5.6-sol","explanationVersion":"v3"},"options":[]}],"options":[],"explanation":{"methods":[{"id":"f7332cc6-13ed-489c-82f8-d32969081bf5:systematic_listing","label":"Systematic Listing","steps":[{"type":"text","order":0,"title":"Understand the problem","content":"We need to make all possible **two-digit numbers** using the three digit cards: $2$, $5$, and $8$.\n\nSince we are using physical cards, we can only use each card once in a single number. This means we cannot have repeated digits like $22$, $55$, or $88$.\n\nTo make sure we find all of them without missing any or repeating ourselves, we will list them systematically by grouping them by their **tens digit**.","highlights":[{"text":"5, 2, 8","location":"specification"},{"text":"two-digit numbers","location":"specification"}]},{"type":"text","order":1,"title":"Start with tens digit 2","content":"Let's choose **$2$** as our tens digit.\n\nThe remaining cards are **$5$** and **$8$**.\n\nPairing $2$ in the tens place with the other two cards gives us:\n* **$25$**\n* **$28$**"},{"type":"text","order":2,"title":"Move to tens digit 5","content":"Next, let's choose **$5$** as our tens digit.\n\nThe remaining cards are **$2$** and **$8$**.\n\nPairing $5$ in the tens place with the other two cards gives us:\n* **$52$**\n* **$58$**"},{"type":"text","order":3,"title":"End with tens digit 8","content":"Finally, let's choose **$8$** as our tens digit.\n\nThe remaining cards are **$2$** and **$5$**.\n\nPairing $8$ in the tens place with the other two cards gives us:\n* **$82$**\n* **$85$**"},{"type":"text","order":4,"title":"Write down final list","content":"Combining our systematic lists, the complete set of two-digit numbers is:\n\n$$\\mathbf{25, 28, 52, 58, 82, 85}$$\n\n**Exam Mark Scheme Guidance:**\n* Listing **at least 3** of these correct numbers earns you **1 mark** M1.\n* Listing **all 6** correct numbers earns you the full **2 marks** A1."}]},{"id":"f7332cc6-13ed-489c-82f8-d32969081bf5:pairwise_grouping","label":"Pairing and Reversing","steps":[{"type":"text","order":0,"title":"Understand the method","content":"To find all possible two-digit numbers, we can use the **Pairing and Reversing** approach:\n\n1. First, select all the possible **pairs** of cards (ignoring the order for a moment).\n2. Second, **reverse** each pair to write down both two-digit permutations.","highlights":[{"text":"5, 2, 8","location":"specification"}]},{"type":"text","order":1,"title":"Find all unique pairs","content":"Let's choose every unique combination of two cards from our three cards: **5**, **2**, and **8**.\n\nThere are exactly $3$ unique pairs of numbers we can choose:\n* Pair 1: **5** and **2**\n* Pair 2: **5** and **8**\n* Pair 3: **2** and **8**"},{"type":"text","order":2,"title":"Make numbers from pairs","content":"Now, for each pair, we write the two possible two-digit numbers by reversing the digits:\n\n* From **5** and **2**, we make: **52** and **25**\n* From **5** and **8**, we make: **58** and **85**\n* From **2** and **8**, we make: **28** and **82**"},{"type":"text","order":3,"title":"List all numbers","content":"Combining these results gives us all $6$ possible two-digit numbers:\n\n$$\\mathbf{52,\\; 58,\\; 25,\\; 28,\\; 85,\\; 82}$$\n\n*Note on exam marks:* \n* Listing at least 3 correct numbers earns **1 mark**.\n* Listing all 6 correct numbers earns **2 marks**."}]},{"id":"f7332cc6-13ed-489c-82f8-d32969081bf5:tree_diagram","label":"Tree Diagram","steps":[{"type":"text","order":0,"title":"Understand the task","content":"We need to find all the possible two-digit numbers we can make using the cards $5$, $2$, and $8$. Since we are using physical cards, we cannot use the same card twice in a single number (so numbers like $55$ or $22$ are not allowed). We can find all combinations systematically using a **tree diagram**.","highlights":[{"text":"5, 2, 8","location":"specification"},{"text":"two-digit numbers","location":"specification"}]},{"type":"text","order":1,"title":"Choose the tens digit","content":"Let's start our tree diagram by choosing the first digit (the tens digit). Since we have three different cards, there are $3$ possible choices for the tens digit:\n\n- The tens digit could be **$5$**\n- The tens digit could be **$2$**\n- The tens digit could be **$8$**\n\nThese will form the three main starting branches of our tree."},{"type":"text","order":2,"title":"Branch for the units digit","content":"Next, we draw branches for the second digit (the units digit). Since we cannot repeat the card we chose for the tens digit, each main branch splits into only $2$ remaining choices:\n\n- If the tens digit is **$5$**, the units digit can be **$2$** or **$8$**.\n- If the tens digit is **$2$**, the units digit can be **$5$** or **$8$**.\n- If the tens digit is **$8$**, the units digit can be **$5$** or **$2$**."},{"type":"text","order":3,"title":"List all outcomes","content":"Now we simply follow each path of our tree diagram from left to right to write down the resulting two-digit numbers:\n\n- From the **$5$** branch: $52$ and $58$\n- From the **$2$** branch: $25$ and $28$\n- From the **$8$** branch: $85$ and $82$\n\nThis gives us a total of $6$ distinct numbers."},{"type":"text","order":4,"title":"State the final answer","content":"Our complete list of numbers is:\n\n**$52$, $58$, $25$, $28$, $85$, $82$**\n\n*Mark Scheme Guide:*\n- Writing down at least 3 correct numbers earns **1 mark**.\n- Writing down all 6 correct numbers earns **2 marks**."}]}],"generatedAt":"2026-06-13T01:50:59.433Z","modelVersion":"gemini-3.5-flash","explanationVersion":"v2"},"firstAttemptFullMarks":null,"walkthroughVideo":{"url":"https://assets.mathsgenie.co.uk/walkthroughs/videos/aef683c7-aa67-4a0c-bee2-0d3e3ff83a4c.mp4","durationSeconds":87,"posterUrl":"https://assets.mathsgenie.co.uk/walkthroughs/videos/aef683c7-aa67-4a0c-bee2-0d3e3ff83a4c.jpg"}},{"id":"6f796044-0f5d-42f7-aa56-6376ab3b0c35","revisionId":"05c5ed50-ff91-4f64-abd1-482f2ec89bc4","questionNumber":"8","questionType":"LA","specification":"Here are three number cards: 9, 5, 7.","difficulty":1,"difficultyBand":"easy","totalMarks":2,"sourceTitle":"Systematic Listing","calculatorUse":"non_calc","isCalculation":false,"parts":[{"id":"84cd6e02-ccf2-4227-8fc4-8b86001e2219","label":"","content":"Write down all the possible three-digit numbers that can be made using the cards.","markscheme":"- 957, 975, 597, 579, 795, 759\n\nAward 1 mark for at least 3 correct numbers. M1\nAward 2 marks for all 6 correct numbers. A1","marks":2,"order":0,"markingRubric":{"totalMarks":2,"points":[{"id":"p1","marks":1,"description":"Lists at least 3 correct three-digit numbers.","code":"M"},{"id":"p2","marks":1,"description":"Lists all 6 correct three-digit numbers.","code":"A"}],"finalAnswers":[],"generatedAt":"2026-05-05T10:23:57.594Z","modelVersion":"gemini-3-flash-preview"},"tableImages":[],"explanation":{"methods":[{"id":"systematic_listing","label":"Systematic listing","steps":[{"type":"text","order":0,"title":"Fix the first card","content":"Keep the first digit fixed, then swap the other two cards. Repeat this for each possible first card. This systematic method prevents missing a number or writing one twice.","highlights":[{"text":"all the possible three-digit numbers","location":"specification"}]},{"type":"text","order":1,"title":"Start with nine","content":"Put $9$ first. The remaining cards can be arranged as $5,7$ or $7,5$, giving\n\n$$957,\\ 975$$"},{"type":"text","order":2,"title":"Start with five","content":"Now put $5$ first. Swap the remaining cards to give\n\n$$597,\\ 579$$\n\nAt this point, you have at least three correct numbers, so you have earned the first mark, M1."},{"type":"text","order":3,"title":"Start with seven","content":"Finally, put $7$ first. Swap the remaining cards to give\n\n$$795,\\ 759$$"},{"type":"text","order":4,"title":"Check the complete list","content":"The complete list is\n\n$$957,\\ 975,\\ 597,\\ 579,\\ 795,\\ 759$$\n\nThere are $6$ different numbers. Each card is used exactly once in every number, and every possible first digit has been considered. All six correct numbers earn the second mark, A1, for $2$ marks in total.","highlights":[{"text":"using the cards","location":"specification"}]}]}],"generatedAt":"2026-07-19T18:08:11.660Z","modelVersion":"gpt-5.6-sol","explanationVersion":"v3"},"options":[]}],"options":[],"explanation":{"methods":[{"id":"84cd6e02-ccf2-4227-8fc4-8b86001e2219:systematic_listing","label":"Systematic Listing","steps":[{"type":"text","order":0,"title":"Understand the goal","content":"We need to find all possible three-digit numbers we can make using the cards **9, 5, and 7** once each. To make sure we do not miss any numbers, we will use a **systematic listing** approach by fixing each card in the hundreds place one by one.","highlights":[{"text":"three-digit numbers that can be made using the cards","location":"specification"}]},{"type":"hyper_latex","block":{"nodes":[{"latex":"$$\\text{Hundreds place} = \\htmlData{anchor=h5}{\\color{@sky}{5}}$"},{"latex":"$$\\text{Remaining digits: } 7, 9$"},{"latex":"$$\\text{Possible numbers: } \\htmlData{anchor=num1}{\\color{@sky}{5}}79, \\; \\htmlData{anchor=num2}{\\color{@sky}{5}}97$"}],"highlights":[{"color":"sky","style":"text-color","anchor":"h5"},{"color":"sky","style":"text-color","anchor":"num1"},{"color":"sky","style":"text-color","anchor":"num2"}],"connections":[{"to":"num1","from":"h5","color":"sky","label":null,"style":"solid"},{"to":"num2","from":"h5","color":"sky","label":null,"style":"solid"}]},"order":1,"title":"Fix 5 in hundreds","description":"First, let's fix the digit 5 in the hundreds place. The remaining cards are 7 and 9. We can arrange them in two ways to get: 579 and 597."},{"type":"hyper_latex","block":{"nodes":[{"latex":"$$\\text{Hundreds place} = \\htmlData{anchor=h7}{\\color{@amber}{7}}$"},{"latex":"$$\\text{Remaining digits: } 5, 9$"},{"latex":"$$\\text{Possible numbers: } \\htmlData{anchor=num3}{\\color{@amber}{7}}59, \\; \\htmlData{anchor=num4}{\\color{@amber}{7}}95$"}],"highlights":[{"color":"amber","style":"text-color","anchor":"h7"},{"color":"amber","style":"text-color","anchor":"num3"},{"color":"amber","style":"text-color","anchor":"num4"}],"connections":[{"to":"num3","from":"h7","color":"amber","label":null,"style":"solid"},{"to":"num4","from":"h7","color":"amber","label":null,"style":"solid"}]},"order":2,"title":"Fix 7 in hundreds","description":"Next, let's fix the digit 7 in the hundreds place. The remaining cards are 5 and 9. Swapping these gives us: 759 and 795."},{"type":"hyper_latex","block":{"nodes":[{"latex":"$$\\text{Hundreds place} = \\htmlData{anchor=h9}{\\color{@purple}{9}}$"},{"latex":"$$\\text{Remaining digits: } 5, 7$"},{"latex":"$$\\text{Possible numbers: } \\htmlData{anchor=num5}{\\color{@purple}{9}}57, \\; \\htmlData{anchor=num6}{\\color{@purple}{9}}75$"}],"highlights":[{"color":"purple","style":"text-color","anchor":"h9"},{"color":"purple","style":"text-color","anchor":"num5"},{"color":"purple","style":"text-color","anchor":"num6"}],"connections":[{"to":"num5","from":"h9","color":"purple","label":null,"style":"solid"},{"to":"num6","from":"h9","color":"purple","label":null,"style":"solid"}]},"order":3,"title":"Fix 9 in hundreds","description":"Finally, let's fix the digit 9 in the hundreds place. The remaining cards are 5 and 7. Swapping these gives us: 957 and 975."},{"type":"text","order":4,"title":"List all possibilities","content":"Putting all our groups together, we get a complete list of **6** possible three-digit numbers:\n\n$$\\mathbf{579, \\; 597, \\; 759, \\; 795, \\; 957, \\; 975}$$\n\n### Markscheme Breakdown\n- **1 mark** (M1) is awarded for listing at least 3 correct numbers.\n- **2 marks** (A1) are awarded for listing all 6 correct numbers without repetitions or extras."}]},{"id":"84cd6e02-ccf2-4227-8fc4-8b86001e2219:tree_diagram","label":"Using a Tree Diagram","steps":[{"type":"text","order":0,"title":"Understand the problem","content":"We have three number cards: **9**, **5**, and **7**. \n\nWe need to find all the possible three-digit numbers we can make by using each card exactly once. To do this systematically and ensure we don't miss any combinations, we can construct a **tree diagram**.","highlights":[{"text":"9, 5, 7","location":"specification"}]},{"type":"text","order":1,"title":"Select the first digit","content":"To build our tree diagram, we start with the first digit of our three-digit number. Since we have three cards, there are three possible choices for the hundreds column (the first digit):\n\n* **9**\n* **5**\n* **7**\n\nThese choices form the three main branches at the first level of our tree."},{"type":"text","order":2,"title":"Branch for the second digit","content":"Now, for each first digit, we branch out to choose the tens column (the second digit). Since we cannot reuse the card we just picked, there are two remaining options for each branch:\n\n* If the first digit is **9**, the remaining cards are **5** and **7**:\n * Branch to **5**\n * Branch to **7**\n* If the first digit is **5**, the remaining cards are **9** and **7**:\n * Branch to **9**\n * Branch to **7**\n* If the first digit is **7**, the remaining cards are **9** and **5**:\n * Branch to **9**\n * Branch to **5**"},{"type":"text","order":3,"title":"Branch for the third digit","content":"Finally, we select the units column (the third digit). Since only one card is left for each path, there is only one final branch for each option:\n\n$$\\begin{array}{ccccc}\n\\text{\\bf First Digit} & & \\text{\\bf Second Digit} & & \\text{\\bf Third Digit} \\\\\n\\hline\n & & 5 & \\longrightarrow & 7 \\\\\n9 & \\nearrow & & & \\\\\n & \\searrow & & & \\\\\n & & 7 & \\longrightarrow & 5 \\\\\n\\hline\n & & 9 & \\longrightarrow & 7 \\\\\n5 & \\nearrow & & & \\\\\n & \\searrow & & & \\\\\n & & 7 & \\longrightarrow & 9 \\\\\n\\hline\n & & 9 & \\longrightarrow & 5 \\\\\n7 & \\nearrow & & & \\\\\n & \\searrow & & & \\\\\n & & 5 & \\longrightarrow & 9 \\\\\n\\end{array}$$"},{"type":"text","order":4,"title":"List all combinations","content":"By tracing each path from the start of the tree to the end, we get our list of six unique three-digit numbers:\n\n* Path $9 \\rightarrow 5 \\rightarrow 7$ gives **957**\n* Path $9 \\rightarrow 7 \\rightarrow 5$ gives **975**\n* Path $5 \\rightarrow 9 \\rightarrow 7$ gives **597**\n* Path $5 \\rightarrow 7 \\rightarrow 9$ gives **579**\n* Path $7 \\rightarrow 9 \\rightarrow 5$ gives **795**\n* Path $7 \\rightarrow 5 \\rightarrow 9$ gives **759**\n\nThese are all the possible combinations."},{"type":"text","order":5,"title":"State the final answer","content":"The six possible three-digit numbers are:\n\n**957, 975, 597, 579, 795, 759**\n\n*Note on marks:* Writing down at least 3 correct numbers earns **1 mark**, and finding all 6 correct numbers earns the full **2 marks**."}]}],"generatedAt":"2026-06-12T19:33:04.799Z","modelVersion":"gemini-3.5-flash","explanationVersion":"v2"},"firstAttemptFullMarks":null,"walkthroughVideo":{"url":"https://assets.mathsgenie.co.uk/walkthroughs/videos/6f796044-0f5d-42f7-aa56-6376ab3b0c35.mp4","durationSeconds":79,"posterUrl":"https://assets.mathsgenie.co.uk/walkthroughs/videos/6f796044-0f5d-42f7-aa56-6376ab3b0c35.jpg"}}],"subjectCode":"gcse_maths__wjec","summaries":[{"id":"a11834c0-8ef4-415e-808a-790d007861c9","difficultyBand":"medium","calculatorUse":"non_calc","totalMarks":2,"questionType":"LA","isCalculation":false},{"id":"047853fb-10d3-4430-a802-56cc155f3c37","difficultyBand":"easy","calculatorUse":"non_calc","totalMarks":2,"questionType":"LA","isCalculation":false},{"id":"4353516c-1169-462a-b357-f61739e5a730","difficultyBand":"hard","calculatorUse":"non_calc","totalMarks":5,"questionType":"LA","isCalculation":true},{"id":"63a7406c-1793-4053-bedc-ca950c9874a4","difficultyBand":"medium","calculatorUse":"non_calc","totalMarks":4,"questionType":"LA","isCalculation":true},{"id":"66858527-9326-4bb5-bb2f-3616da92bf9a","difficultyBand":"medium","calculatorUse":"non_calc","totalMarks":3,"questionType":"LA","isCalculation":false},{"id":"674e600b-eea9-47fd-9178-d24b004fc12d","difficultyBand":"easy","calculatorUse":"non_calc","totalMarks":2,"questionType":"LA","isCalculation":false},{"id":"893f5127-ceaf-4d45-aed2-7e1030e37129","difficultyBand":"easy","calculatorUse":"non_calc","totalMarks":2,"questionType":"LA","isCalculation":false},{"id":"89baea03-7e1b-44b2-b754-1ae9266b6d50","difficultyBand":"medium","calculatorUse":"non_calc","totalMarks":3,"questionType":"LA","isCalculation":true},{"id":"9e2f408b-d7b7-4e96-9d74-dcd8aa9b4596","difficultyBand":"easy","calculatorUse":"non_calc","totalMarks":2,"questionType":"LA","isCalculation":false},{"id":"a5e17387-b5d8-4ed9-82f9-8b46c0de8b70","difficultyBand":"medium","calculatorUse":"non_calc","totalMarks":2,"questionType":"LA","isCalculation":false},{"id":"b6d20b57-6838-4d8d-966e-d02c1a8682e4","difficultyBand":"medium","calculatorUse":"non_calc","totalMarks":3,"questionType":"LA","isCalculation":true},{"id":"dcac32b7-b239-4559-b90c-c0b81afb6681","difficultyBand":"medium","calculatorUse":"non_calc","totalMarks":3,"questionType":"LA","isCalculation":false},{"id":"fc13b73f-11e1-4601-a0cd-7e1381c1217b","difficultyBand":"medium","calculatorUse":"non_calc","totalMarks":2,"questionType":"LA","isCalculation":false},{"id":"d9d9f51c-708e-4f52-a850-754865c0f5b8","difficultyBand":"medium","calculatorUse":"non_calc","totalMarks":2,"questionType":"LA","isCalculation":false},{"id":"0e1ede1a-5d4f-4fc6-b62e-5cc5cec38f7d","difficultyBand":"hard","calculatorUse":"non_calc","totalMarks":5,"questionType":"LA","isCalculation":false},{"id":"18fe2801-1185-4c94-bc59-3f83c85569bf","difficultyBand":"medium","calculatorUse":"non_calc","totalMarks":3,"questionType":"LA","isCalculation":false},{"id":"275acb06-178b-41ca-9918-bc14b2634605","difficultyBand":"medium","calculatorUse":"non_calc","totalMarks":3,"questionType":"LA","isCalculation":true},{"id":"33be85e2-22ae-4808-b037-85bac04e5b96","difficultyBand":"medium","calculatorUse":"non_calc","totalMarks":2,"questionType":"LA","isCalculation":false},{"id":"381814e5-89ba-4932-9730-5c0302bbca01","difficultyBand":"medium","calculatorUse":"non_calc","totalMarks":3,"questionType":"LA","isCalculation":false},{"id":"6bead88b-8173-4a11-a37e-d1a68b438f89","difficultyBand":"easy","calculatorUse":"non_calc","totalMarks":2,"questionType":"LA","isCalculation":false},{"id":"75c896b9-03d4-428e-8b47-dc5407c8333c","difficultyBand":"medium","calculatorUse":"non_calc","totalMarks":2,"questionType":"LA","isCalculation":false},{"id":"90d999f9-cc88-4b24-9b0f-2115de315c25","difficultyBand":"medium","calculatorUse":"non_calc","totalMarks":2,"questionType":"LA","isCalculation":false},{"id":"b282365c-baad-4e38-9481-4df66868e039","difficultyBand":"easy","calculatorUse":"non_calc","totalMarks":2,"questionType":"LA","isCalculation":false},{"id":"b71734d9-c5e5-4dac-bb0c-05a6837059f5","difficultyBand":"medium","calculatorUse":"non_calc","totalMarks":3,"questionType":"LA","isCalculation":true},{"id":"f86229be-e586-40ba-a47f-3b7382f80b7f","difficultyBand":"easy","calculatorUse":"non_calc","totalMarks":2,"questionType":"LA","isCalculation":false},{"id":"143293d5-abf2-45b3-8bde-bc3ab586a1ff","difficultyBand":"medium","calculatorUse":"non_calc","totalMarks":2,"questionType":"LA","isCalculation":false},{"id":"0ae3e9e7-c60a-435e-a6bb-df0fc8f2c856","difficultyBand":"medium","calculatorUse":"non_calc","totalMarks":3,"questionType":"LA","isCalculation":true},{"id":"490f5f51-6650-4c81-8ae7-fea04ad251ef","difficultyBand":"medium","calculatorUse":"non_calc","totalMarks":3,"questionType":"LA","isCalculation":false},{"id":"4e1bc8c6-a74d-4c94-818a-d460a298a235","difficultyBand":"easy","calculatorUse":"non_calc","totalMarks":2,"questionType":"LA","isCalculation":false},{"id":"833dfef1-f444-4019-b7f3-e79fea545630","difficultyBand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Listing","topicId":"d5330226-87c5-c199-a724-400118f07cba","topicSidebar":"$L39","topicSlug":"grade-2-2-3-systematic-listing","topicTitle":"Systematic Listing"}]}],"$L3a","$L3b"]}]

Systematic Listing

Question 14

Systematic Listing Questions

Systematic Listing

Question 14

Systematic Listing Questions