Q. 84.2( 5 Votes )

If (n + 1)! = 90 [(n – 1)!], find n.

Answer :

Given: (n + 1)! = 90 [(n – 1)!]


To Find : n ?


(n + 1) × (n) × (n-1)! = 60 [(n – 1)!]


(n + 1) × (n) = 90


(n + 1) × (n) = 10 × 9


n = 9


Hence, n = 9


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