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Which is the correct expansion of \( \frac{(n+1)!}{(n-3)!} \)?

Answer and explanation

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

\((n+1)!=(n+1)n(n-1)(n-2)(n-3)!\). On dividing by \((n-3)!\), the common factorial cancels, leaving \((n+1)n(n-1)(n-2)\). Option B incorrectly omits the factor \((n-2)\). Exam tip: In a factorial quotient, expand the numerator down to the denominator factorial and then cancel common terms.

Related tags

Factorial NotationFactorial SimplificationPermutations And CombinationsClass 11 MathematicsMathematicsClass 11 Mcq

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