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Algebra Difficulty 1.0 Junior Find the answer United Kingdom

Which of these is equal to $3^3 + 4^3 + 5^3$ ?

(A) $6^3$ (B) $8^3$ (C) $10^3$ (D) $12^3$ (E) $12^9$

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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.