Mathematics help - Factorials

Mathematics
Tutor: None Selected Time limit: 1 Day

I need help with calculating factorials quickly. 

One of my friends is able to excel in my math class because he is able to compute higher level factorials very quickly. Is there a trick to do this? Or is it done through memorization?

Oct 4th, 2014

Mostly comes up to memorization - they roll on each other. 

Oct 4th, 2014

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Oct 4th, 2014
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Oct 4th, 2014
Dec 3rd, 2016
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