A scientist is testing four different materials—Rubber, Steel, Wood, and Glass—in pairs to see how they interact. Every material must be tested against every other material once.
List all the pairs of materials that will be tested.
After the tests, the materials are ranked from 1st to 4th based on their durability. List all the possible rankings of the materials.
Practise AQA GCSE Maths Systematic Listing with exam-style questions for Foundation and Higher tier. 47 questions, matched to the AQA GCSE Maths (8300) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.