| Exam Board | OCR |
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| Module | H240/02 (Pure Mathematics and Statistics) |
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| Year | 2019 |
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| Session | June |
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| Topic | Proof |
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6 Shona makes the following claim.
" \(n\) is an even positive integer greater than \(2 \Rightarrow 2 ^ { n } - 1\) is not prime"
Prove that Shona's claim is true.