statement.html

problem 20 · 5 lines

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<p>$n!$ means $n \times (n - 1) \times \cdots \times 3 \times 2 \times 1$.</p>
<p>For example, $10! = 10 \times 9 \times \cdots \times 3 \times 2 \times 1 = 3628800$,<br/>and the sum of the digits in the number $10!$ is $3 + 6 + 2 + 8 + 8 + 0 + 0 = 27$.</p>
<p>Find the sum of the digits in the number $100!$.</p>
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