Answer
8,109,673,360,588,800
Work Step by Step
$(\frac{20!}{300})$
=$\frac{(20\times19\times18\times17\times16\times15\times14\times13\times12\times11\times10\times9\times8\times7\times6\times5\times4\times3\times2\times1)}{300}$
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