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1.1 Proof

1.1 Proof

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Question 75
i.

Use proof by contradiction to show that for all real values of xxx,

(x−6)2≥2x−46 (x - 6)^2 \geq 2x - 46 (x−6)2≥2x−46
[3]
ii.

Show that the following statement is untrue:

"2n+2n−12^n + 2n - 12n+2n−1 is a prime number for all values of n∈Z+n \in \mathbb{Z}^{+}n∈Z+."

[3]
Markscheme

1.1 Proof Questions

  1. A Level
  2. /Maths
  3. /1.1 Proof

132 exam-style questions on OCR (MEI) A Level Maths 1.1 Proof, covering 1.1.1 Structure of mathematical proof, 1.1.2 Disproof by counter example, 1.1.3 Proof by contradiction (A-level only), and 1.1 Proof. Each one has a worked solution and a mark scheme showing where the marks go.

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