n n\,n is an integer. Prove algebraically that the sum of n(n+1)n(n + 1)n(n+1) and n+1n + 1n+1 is always a square number.
Practise OCR GCSE Maths Proof with exam-style questions for Foundation and Higher tier. 56 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.