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If \( \frac{(n+2)!+(n+1)!}{(n+1)!}=14 \), what is the value of (n)?

Answer and explanation

Correct answer: 11

Using \((n+2)!=(n+2)(n+1)!\), the expression becomes \(\frac{(n+2)(n+1)!+(n+1)!}{(n+1)!}\). Dividing by \((n+1)!\) gives \(n+2+1=n+3\). Hence, \(n+3=14\), so \(n=11\). If 12 were used, the expression would equal 15, not 14. Exam tip: In factorial questions, rewrite the larger factorial in terms of the smaller one before simplifying.

Related tags

Factorial NotationFactorial SimplificationPermutations And CombinationsAlgebraic EquationsClass 11 MathematicsMathematicsClass 11 Mcq

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