Evaluate n!/(n-r)! when n=9,r=5

Answers (1)

When n=9,r=5,
fracn!(n-r)!=frac9!(9-5)!=frac9!4!=frac9	imes 8	imes 7 	imes 6 	imes5 	imes4!4!
=9	imes8	imes7	imes6	imes5=15120

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