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If \(\frac{(n+5)!}{(n+3)!}=210\), what is the value of \(n\)?

Answer and explanation

Correct answer: 10

Using cancellation of factorials, \(\frac{(n+5)!}{(n+3)!}=(n+5)(n+4)\). Thus, \((n+5)(n+4)=210\). For \(n=10\), the product is \(15\times14=210\), so the correct answer is 10. Option 9 is incorrect because it gives \(14\times13=182\). Exam tip: cancel the common factorial terms before solving the resulting quadratic or product equation.

Related tags

PermutationsCombinationsFactorial EquationsConsecutive IntegersAlgebraPermutations And CombinationsMathematicsClass 11 Mcq

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