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What is the value of \(\frac{6!}{5!}\times\frac{5!}{3!}\)?

Answer and explanation

Correct answer: 120

\(\frac{6!}{5!}=6\) and \(\frac{5!}{3!}=5\times4=20\), because the common factorial terms in the numerator and denominator cancel. Hence, the expression equals \(6\times20=120\). Getting \(100\) indicates incorrect expansion or cancellation of factorial terms. Exam tip: In factorial ratios, cancel the common factorial terms first, then multiply the remaining consecutive integers.

Related tags

Factorial NotationFactorial SimplificationPermutations And CombinationsClass 11 MathematicsMathematicsClass 11 Mcq

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