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If \(\frac{n!}{(n-4)!}=3024\) then what is the value of (n)?

Answer and explanation

Correct answer: 9

After cancelling \((n-4)!\), we get \(\frac{n!}{(n-4)!}=n(n-1)(n-2)(n-3)\). Since \(9\times8\times7\times6=3024\), \(n=9\). For the closest distractor, \(n=10\) gives \(10\times9\times8\times7=5040\), not 3024. Exam tip: rewrite such factorial ratios as products of consecutive decreasing integers.

Related tags

Factorial NotationFactorial EquationsPermutations And CombinationsConsecutive IntegersClass 11 MathematicsMathematicsClass 11 Mcq

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