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UKMT Junior Mathematical Challenge, 2021

Algebra Difficulty 1.0 Junior Find the answer United Kingdom

What is the value of $\left(2 - \frac{1}{2}\right)\left(3 - \frac{1}{3}\right)\left(4 - \frac{1}{4}\right)$ ?

(A) $16$ (B) $15$ (C) $14$ (D) $13$ (E) $12$

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