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What is the simplified form of \( \frac{(n+4)!+(n+3)!}{(n+2)!} \)?

Answer and explanation

Correct answer: \((n+3)(n+5)\)

Since \((n+4)!=(n+4)(n+3)!\), the numerator becomes \((n+3)![(n+4)+1]=(n+3)!(n+5)\). Using \((n+3)!=(n+3)(n+2)!\), we get \(\frac{(n+3)!(n+5)}{(n+2)!}=(n+3)(n+5)\). Option C incorrectly retains \(n+4\) instead of obtaining \(n+5\). Exam tip: when adding factorial terms, factor out the smaller factorial first.

Related tags

Factorial NotationFactorial SimplificationPermutations And CombinationsAlgebraic ExpressionsClass 11 MathematicsMathematicsClass 11 Mcq

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