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If \(\frac{(n+6)!}{(n+4)!}=272\) then what is the value of (n)?

Answer and explanation

Correct answer: \(10\)

Since \((n+6)!=(n+6)(n+5)(n+4)!\), we get \(\frac{(n+6)!}{(n+4)!}=(n+6)(n+5)\). Thus, \((n+6)(n+5)=272\). As \(16\times17=272\), \(n+5=16\), so \(n=10\). For \(n=11\), the product would be \(17\times18\), not 272. Exam tip: In a factorial quotient, write the remaining consecutive factors before cancelling the common factorial term.

Related tags

Factorial NotationPermutations And CombinationsFactorial SimplificationQuadratic EquationClass 11 MathematicsMathematicsClass 11 Mcq

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