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UKMT Junior Mathematical Challenge, 2015

Algebra Difficulty 1.0 Junior Find the answer United Kingdom

In the expression $1 \square 2 \square 3 \square 4$ each $\square$ is to be replaced by either $+$ or $\times$ . What is the largest value of all the expressions that can be obtained in this way?

(A) $10$ (B) $14$ (C) $15$ (D) $24$ (E) $25$

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