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What is the value of \(4!\times\frac{6!}{5!}-3!\)?

Answer and explanation

Correct answer: 138

\(4!=24\) and \(3!=6\). Also, \(\frac{6!}{5!}=\frac{6\times5!}{5!}=6\). Therefore, the expression becomes \(24\times6-6=144-6=138\). Option D, 144, results if \(3!\) is not subtracted at the end. Exam tip: For a quotient of consecutive factorials, write the larger factorial in terms of the smaller one and cancel common factors.

Related tags

Factorial NotationFactorial SimplificationPermutations And CombinationsClass 11 MathematicsMathematicsClass 11 Mcq

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