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What is the value of \(\frac{11!-10!}{9!}\)?

Answer and explanation

Correct answer: 100

Since \(11!=11\times10!\), we get \(11!-10!=11\times10!-10!=10!(11-1)=10\times10!\). Also, \(10!=10\times9!\), so \(\frac{10\times10!}{9!}=10\times10=100\). Hence, 100 is the correct answer. The value 110 can result from not simplifying the subtraction involving \(11!\) and \(10!\) correctly. Exam tip: When factorial terms are subtracted, first factor out the smaller factorial.

Related tags

Factorial NotationPermutations And CombinationsClass 11 MathematicsFactorial SimplificationMathematicsClass 11 Mcq

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