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Number theory Difficulty 2.0 Junior Find the answer United Kingdom

What is the largest prime factor of $106^2 - 15^2$ ?

(A) $3$ (B) $7$ (C) $11$ (D) $13$ (E) $17$

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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.