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3.1.1 Proof (A-level only)

Why can checking many examples not prove a universal statement?

A

a2a^2a2 is even, so aaa is even.

B

Examples do not cover every case allowed by the conditions.

C

If NNN is prime, it is a prime missing from the list. If NNN is composite, it has a prime factor missing from the list.

D

If n=2k+1n=2k+1n=2k+1, then n2=2(2k2+2k)+1n^2=2(2k^2+2k)+1n2=2(2k2+2k)+1, showing that n2n^2n2 is odd.

3.1.1 Proof (A-level only) Flashcards

  1. A Level
  2. /Maths
  3. /3.1.1 Proof (A-level only)

Flashcards for WJEC A Level Maths 3.1.1 Proof (A-level only), covering the key formulae, methods and definitions you need to recall for AS Unit 1, AS Unit 2, A2 Unit 3 and A2 Unit 4. 22 cards, matched to the WJEC A Level Maths (1300QS) specification. Recall questions account for roughly 50% of marks at A Level Maths, so these target the marks you can secure before the paper starts.