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Algebra Difficulty 1.0 Junior Find the answer United Kingdom

$\sqrt{\sqrt{x}} = 3$ . What is the value of $x$ ?

(A) $\sqrt{\sqrt{3}}$ (B) $\sqrt{3}$ (C) $9$ (D) $12$ (E) $81$

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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.