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

Answer and explanation

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

Using \((n+3)!=(n+3)(n+2)!\), the numerator becomes \((n+2)![(n+3)-1]=(n+2)!(n+2)\). Since \((n+2)!=(n+2)(n+1)!\), \(\frac{(n+2)!(n+2)}{(n+1)!}=(n+2)^2\). The option \((n+3)^2\) does not correctly account for subtracting \((n+2)!\). Exam tip: in factorial subtraction, first factor out the smaller common factorial.

Related tags

Factorial NotationFactorial SimplificationPermutations And CombinationsAlgebraic SimplificationClass 11 MathematicsMathematicsClass 11 Mcq

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