document.write( "Question 580732: how do I calculate 20! on my calculator? \n" ); document.write( "
Algebra.Com's Answer #371347 by Alan3354(69443)\"\" \"About 
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how do I calculate 20! on my calculator?
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\n" ); document.write( "If it has a factorial button, the !, press 2, 0, !
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\n" ); document.write( "If it doesn't, multiply 20*19*18*17.....*2 = 20!
\n" ); document.write( "Get a calculator that has the ! button.
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