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What is the value of \(\frac{10!+9!}{8!}\)?

Answer and explanation

Correct answer: 99

Writing \(10!=10\times9!\), the numerator becomes \(10\times9!+9!=9!(10+1)=11\times9!\). Hence, \(\frac{11\times9!}{8!}=11\times9=99\). Therefore, 99 is the correct answer. A value such as 108 may result from an incorrect addition while taking the common factorial. Exam tip: In factorial fractions, first express numerator terms using the same smaller factorial.

Related tags

Factorial NotationFactorial SimplificationPermutations And CombinationsAlgebraic SimplificationClass 11 MathematicsMathematicsClass 11 Mcq

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