n n\,n is an integer. Prove algebraically that the sum of (n+2)(n+1)(n + 2)(n + 1)(n+2)(n+1) and n+2n + 2n+2 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.