find the value of n, if n! / (n - 2 )! = 930 , n =4 .

ans : 31

the given equation is:
n!(n-2)!=930n.(n-1)(n-2)!(n-2)!=930n(n-1)=930n2-n-930=0n2-31n+30n-930=0n(n-31)+30(n-31)=0(n-31)(n+30)=0n=31 or n =-30
since n can not be negative; n = 31

hope this helps you

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