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Which is the correct expansion of \( \frac{(n+4)!}{(n+2)!} \)?

Answer and explanation

Correct answer: \((n+4)(n+3)\)

Since \((n+4)!=(n+4)(n+3)(n+2)!\), dividing by \((n+2)!\) cancels the common factorial and gives \(\frac{(n+4)!}{(n+2)!}=(n+4)(n+3)\). Option A incorrectly retains an extra factor \((n+2)\). Exam tip: Expand the larger factorial only up to the smaller factorial, then cancel the common part.

Related tags

Factorial NotationFactorial SimplificationPermutations And CombinationsAlgebraic ExpressionsClass 11 MathematicsMathematicsClass 11 Mcq

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