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What is the value of \(\frac{7!}{4!,3!}+\frac{7!}{6!,1!}\)?

Answer and explanation

Correct answer: 42

The first term is \(\frac{7!}{4!\,3!}=\frac{7\times6\times5}{3\times2\times1}=35\). The second term is \(\frac{7!}{6!\,1!}=7\). Hence, the total is \(35+7=42\). \(35\) is only the value of the first term, while \(49\) may result from incorrectly multiplying the two terms instead of adding them. Exam tip: In factorial fractions, cancel common factorial factors before calculating.

Related tags

Factorial NotationBinomial CoefficientsPermutations And CombinationsClass 11 MathematicsCombinatoricsMathematicsClass 11 Mcq

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