From Paper 2: Pure Mathematics and Statistics
48 marks
(a) Prove by contradiction that if n3 is even then n is even.
(b) Prove that there are no integers a and b such that 6a + 9b = 1.
This paper is written by Plasmo in the style of the OCR A-Level Maths exam. It is not a past paper and is not produced or endorsed by the exam board.