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How would I calculate something like 30! by hand? Is it necessarily tedious? Or are there some techniques to make it faster and easier?

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    $\begingroup$ Depends on what form you want it in. You can pretty easily do the prime factorization for example. $\endgroup$ – Adam Hughes Aug 13 '16 at 15:26
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    $\begingroup$ There are approximations to calculate factorials, like the Stirling approximation and Ramanujan's factorial approximation. $\endgroup$ – Curious Aug 13 '16 at 15:29
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    $\begingroup$ Do you want the exact value, or is an approximation sufficient? Do you have log tables at hand? $\endgroup$ – Ross Millikan Aug 13 '16 at 15:43

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