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Algebra Difficulty 1.0 Junior Find the answer United Kingdom

When evaluated, which of the following is not an integer?

(A) $1^{-1}$ (B) $4^{-\frac{1}{2}}$ (C) $6^0$ (D) $8^{\frac{2}{3}}$ (E) $16^{\frac{3}{4}}$

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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.