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

Answer and explanation

Correct answer: \((n+3)^2\)

Write \((n+4)!=(n+4)(n+3)!\). The numerator becomes \((n+3)![(n+4)-1]=(n+3)!(n+3)\). Since \((n+3)!=(n+3)(n+2)!\), we get \(\frac{(n+3)!(n+3)}{(n+2)!}=(n+3)^2\). Hence, option A is correct. \((n+4)^2\) incorrectly retains an extra factor of \(n+4\). Exam tip: In factorial expressions, first factor out the smallest common factorial.

Related tags

Factorial NotationFactorial SimplificationPermutations And CombinationsAlgebraic SimplificationClass 11 MathematicsMathematicsClass 11 Mcq

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