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What is the simplified form of \(\frac{(n+5)!}{(n+4)!}\)?

Answer and explanation

Correct answer: \(n+5\)

Using factorial expansion, \((n+5)!=(n+5)(n+4)!\). Therefore, \(\frac{(n+5)!}{(n+4)!}=n+5\), since \((n+4)!\) cancels out. Choosing \(n+4\) misses the extra factor \(n+5\) in the numerator. Exam tip: Expand the larger factorial up to the smaller factorial, then cancel the common factor.

Related tags

Factorial NotationPermutations And CombinationsClass 11Algebraic SimplificationMathematicsClass 11 Mcq

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