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, 2017

Number theory Difficulty 1.0 Junior Find the answer United Kingdom

One of the following numbers is prime. Which is it?

(A) $2017-2$ (B) $2017-1$ (C) $2017$ (D) $2017+1$ (E) $2017+2$

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Source: UK Mathematics Trust, licensed © UK Mathematics Trust; past papers published free at ukmt.org.uk. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.