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What is the value of \( \frac{10!+3\cdot9!}{8!} \)?

Answer and explanation

Correct answer: 117

Using \(10!=10\cdot9\cdot8!\) and \(9!=9\cdot8!\), we get \(\frac{10!+3\cdot9!}{8!}=\frac{10\cdot9\cdot8!+3\cdot9\cdot8!}{8!}=90+27=117\). Hence, 117 is correct. A result such as 126 may arise from multiplying the \(3\cdot9!\) term incorrectly. Exam tip: express every factorial in terms of the factorial in the denominator, here \(8!\), before simplifying.

Related tags

Factorial NotationFactorial SimplificationPermutations And CombinationsAlgebraic SimplificationClass 11 MathematicsMathematicsClass 11 Mcq

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