MathDB

18

Part of 2009 Math Prize For Girls Problems

Problems(1)

the digits of 21 factorial

Source:

11/15/2009
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?
factorial