SOLUTION: how do I calculate 20! on my calculator?

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Question 580732: how do I calculate 20! on my calculator?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
how do I calculate 20! on my calculator?
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If it has a factorial button, the !, press 2, 0, !
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If it doesn't, multiply 20*19*18*17.....*2 = 20!
Get a calculator that has the ! button.