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UKMT Junior Mathematical Challenge, 2017

Number theory Difficulty 2.0 Junior Find the answer United Kingdom

In a crossnumber, ACROSS: 1. A cube; 3. A power of 11. DOWN: 2. A square. What is the sum of the digits in the completed crossnumber?

(A) $25$ (B) $29$ (C) $32$ (D) $34$ (E) $35$

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