A shop sells 40 different types of chocolate bar. Kieran wants to buy two different types of chocolate bar.
How many different pairs of chocolate bars can he choose?
Practise Edexcel GCSE Maths The Product Rule for Counting with exam-style questions for Foundation and Higher tier. 68 questions, matched to the Edexcel GCSE Maths (1MA1) 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.