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If \(n(n-1)=72\), what will be the value of \(\frac{n!}{(n-2)!}\)?

Answer and explanation

Correct answer: 72

Since \(n!=n(n-1)(n-2)!\), \(\frac{n!}{(n-2)!}=n(n-1)\). The question gives \(n(n-1)=72\), so the value of the expression is \(72\). \(144\) could arise from incorrectly doubling the given value. Exam tip: In a factorial fraction, expand the numerator only up to the factorial in the denominator, then cancel common factors.

Related tags

Factorial NotationFactorial SimplificationPermutations And CombinationsClass 11 MathematicsMathematicsClass 11 Mcq

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