MathDB
the digits of 21 factorial

Source:

November 15, 2009
factorial

Problem Statement

The value of 21! 21! is 51,090,942,171,abc,440,000 51{,}090{,}942{,}171{,}abc{,}440{,}000, where a a, b b, and c c are digits. What is the value of 100a \plus{} 10b \plus{} c?
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