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

Answer and explanation

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

Using \((n+3)!=(n+3)(n+2)(n+1)n!\), we get \(\frac{(n+3)!}{n!}=(n+3)(n+2)(n+1)\). Dividing this by \(n+3\) leaves \((n+2)(n+1)\). Option B is not correct because it still contains the factor \(n+3\). Exam tip: In factorial divisions, expand the larger factorial only up to the smaller factorial, then cancel common factors.

Related tags

Factorial NotationFactorial SimplificationPermutations And CombinationsAlgebraic SimplificationClass 11 MathematicsMathematicsClass 11 Mcq

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