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What is the value of \(\frac{9!-8!}{7!}\)?

Answer and explanation

Correct answer: 64

As \(9!=9\times8!\), we get \(9!-8!=9\times8!-8!=8!(9-1)=8\times8!\). Also, \(8!=8\times7!\). Therefore, \(\frac{8\times8!}{7!}=8\times8=64\). Hence, 64 is the correct answer. The value 72 may result from expanding or cancelling factorial terms incorrectly. Exam tip: first factor out the smaller factorial in such expressions.

Related tags

Factorial NotationFactorial SimplificationPermutations And CombinationsClass 11 MathematicsMathematicsClass 11 Mcq

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