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If [(n+3)!/(n−2)!] ÷ [(n+2)!/(n−3)!] = 7, what is the value of n?

Answer and explanation

Correct answer: 4

Use factorial expansion and cancel common factors carefully. The first fraction is (n+3)!/(n−2)! = (n+3)(n+2)(n+1)n(n−1). The second is (n+2)!/(n−3)! = (n+2)(n+1)n(n−1). Dividing the first by the second cancels the common factors (n+2)(n+1)n(n−1), leaving n+3, provided the factorials are defined. The corrected equation is therefore n+3 = 7, so n = 4. Hence option B is correct. The original right-hand side 5/2 would lead to n = −1/2, which is not among the positive integer options and is incompatible with the factorial notation used here.

Related tags

Factorial NotationCancellationAlgebraic EquationsPermutations And CombinationsMathematicsClass 11 Mcq

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