P(n,3)=504
504=n!/n-3!
504=n(n-1)(n-2)(n-3)!/n-3! then cancel n-3!
504=n(n-1)(n-2)
504=9×8×7
so n=9
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Answers & Comments
P(n,3)=504
504=n!/n-3!
504=n(n-1)(n-2)(n-3)!/n-3! then cancel n-3!
504=n(n-1)(n-2)
504=9×8×7
so n=9