A group of 12 friends meet at a cafe.
Every person in the group buys a small gift for every other person in the group. However, instead of exchanging gifts, they decide to pair up and take one photo of every possible pair of people.
Work out the total number of photos taken.
Practise OCR GCSE Maths The Product Rule for Counting with exam-style questions for Foundation and Higher tier. 68 questions, matched to the OCR GCSE Maths (J560) specification and written in the written papers 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.