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What is the value of \(\frac{7!}{3!\cdot4!}\)?

Answer and explanation

Correct answer: 35

Since \(7!=7\times6\times5\times4!\), \(\frac{7!}{3!\cdot4!}=\frac{7\times6\times5}{3!}=\frac{7\times6\times5}{6}=35\). Therefore, 35 is the correct option. Getting 42 is a common error caused by not dividing correctly by \(3!=6\). Exam tip: In factorial fractions, cancel common factorial terms first and then multiply the remaining factors.

Related tags

Factorial NotationPermutations And CombinationsBinomial CoefficientClass 11 MathematicsFactorial SimplificationMathematicsClass 11 Mcq

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