1.1 Proof by Contradiction

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Use proof by contradiction to prove that $5\sqrt{5}$ is irrational.

(You may assume that if $n$ is an integer and $n^2$ is a multiple of 5, then $n$ is a multiple of 5).

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1.1 Proof by Contradiction Questions

Practise Edexcel A Level Maths 1.1 Proof by Contradiction with exam-style questions for A Level Maths. 100 questions, matched to the Edexcel A Level Maths (9MA0) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.