Hello everyone. Is the an easier way to I evaluate a factorial like the following without writing every number out and canceling. 20!9! 7!21! Thanks
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Originally Posted by troe Hello everyone. Is the an easier way to I evaluate a factorial like the following without writing every number out and canceling. 20!9! 7!21! Thanks $\displaystyle \frac{20!}{21!}\frac{9!}{7!}= \frac{20!}{21(20!)}\frac{9(8)7!}{7!}$
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