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1.1 Proof

1.1 Proof

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Question 18

Use proof by contradiction to show that there exist no integers x x\,x and y y\,y such that 15x+20y=215x + 20y = 215x+20y=2.

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Markscheme

1.1 Proof Questions

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

107 exam-style questions on OCR A Level Maths 1.1 Proof, covering 1.1.1 Structure of mathematical proof, 1.1.2 Logical connectives, 1.1.3 Disproof by counter example, 1.1.4 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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