Elements

If the number of elements is decreased by two the number of permutations is decreased 30 times. How many elements are?

Result

n =  30

Solution:

P(n)=n! P(n)=30 P(n1) n!=30(n1)! n(n1)!=30(n1)! n=30P(n)=n! \ \\ P(n)=30 \ P(n-1) \ \\ n!=30 (n-1)! \ \\ n(n-1)!=30 (n-1)! \ \\ n=30



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