A computer network consists of 15 servers.
Every server is connected to every other server by exactly one direct cable.
Work out the total number of cables needed for the network.
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.