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Why can checking examples not prove a conjecture?
A
a2=2b2a^2=2b^2a2=2b2.
B
a2a^2a2 is even, so the parity result gives aaa even.
C
Examples do not cover every possible case.
D
An even integer has the form 2k\boxed{2k}2k, while an odd integer has the form 2k+12k+12k+1.
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1.1.4 Proof by contradiction (A-level only) Flashcards
22 flashcards on OCR A Level Maths 1.1.4 Proof by contradiction (A-level only): the key formulae, methods and definitions you need to recall for Paper 1, Paper 2 and Paper 3.