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Number theory Difficulty 1.0 Junior Find the answer United Kingdom

What is the difference between the smallest two-digit prime and the largest two-digit prime?

(A) $86$ (B) $84$ (C) $82$ (D) $80$ (E) $78$

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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.