Evaluate \frac{n !}{(n-r) !} whenn= 10, r= 4 – InterviewSolution

1.	Evaluate \frac{n !}{(n-r) !} whenn= 10, r= 4
Answer» 10!/(10-4)! = 10!/6! = (10×9×8×7×6!)/6! = 10×9×8×7 = 5040

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