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What is the simplified form of (n + 2)!/[(n − 2)! · n(n − 1)]?

Answer and explanation

Correct answer: (n + 2)(n + 1)

Expand the numerator only as far as necessary to expose the denominator factors. We have (n + 2)! = (n + 2)(n + 1)n(n − 1)(n − 2)!. Substituting this into the fraction gives [(n + 2)(n + 1)n(n − 1)(n − 2)!]/[(n − 2)! · n(n − 1)]. The common factors (n − 2)!, n, and n − 1 cancel, leaving (n + 2)(n + 1). Therefore option A is correct. Option B is a cancelled denominator part, option C omits the factor n + 2, and option D incorrectly retains n − 1 instead of n + 1. The cancellation requires nonzero denominator factors.

Related tags

Factorial SimplificationAlgebraic CancellationClass 11 MathematicsFactorial NotationPermutations And CombinationsMathematicsClass 11 Mcq

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