1.

Find the value of nnp5 = 6720?​

Answer»

Answer:

nP 5=n! /(n-5)!

6720=n! /(n-5)!

6720=n(n-1) (n-2) (n-3) (n-4) (n-5)! /(n-5)!

6720=n(n-1) (n-2) (n-3) (n-4)

8*7*6*5*4=n(n-1) (n-2) (n-3) (n-4)

8(8-1) (8-2) (8-3) (8-4) =n(n-1) (n-2) (n-3) (n-4)

so, n=8


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