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Algebra Difficulty 1.0 Junior Find the answer United Kingdom

What is $\sqrt{123454321}$ ?

(A) $1111111$ (B) $111111$ (C) $11111$ (D) $1111$ (E) $111$

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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.