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What is the simplified form of \( \frac{\frac{(n+2)!}{(n-2)!}}{\frac{(n+1)!}{(n-3)!}} \)?

Answer and explanation

Correct answer: \(\frac{n+2}{n-2}\)

\((n+2)!/(n-2)!=(n+2)(n+1)n(n-1)\), while \((n+1)!/(n-3)!=(n+1)n(n-1)(n-2)\). Cancelling the common factors \((n+1)n(n-1)\) gives \(\frac{n+2}{n-2}\). Option B uses incorrect remaining factors. Exam tip: In factorial quotients, expand the larger factorial only up to the smaller one, then cancel common factors.

Related tags

Factorial NotationFactorial SimplificationPermutations And CombinationsAlgebraic FractionsClass 11 MathematicsMathematicsClass 11 Mcq

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