Evaluate
6840
Factor
2^{3}\times 3^{2}\times 5\times 19
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\frac{2432902008176640000}{\left(20-3\right)!}
The factorial of 20 is 2432902008176640000.
\frac{2432902008176640000}{17!}
Subtract 3 from 20 to get 17.
\frac{2432902008176640000}{355687428096000}
The factorial of 17 is 355687428096000.
6840
Divide 2432902008176640000 by 355687428096000 to get 6840.
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