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What is the value of \(\frac{17!}{15!}-\frac{16!}{14!}\)?

Answer and explanation

Correct answer: 32

\(\frac{17!}{15!}=17\times16\) because \(15!\) cancels. Similarly, \(\frac{16!}{14!}=16\times15\). Therefore, the value is \(17\times16-16\times15=16(17-15)=32\). Values such as 30 or 34 can result from subtracting the factors incorrectly. Exam tip: In factorial fractions, expand only up to the smaller factorial and cancel the common part.

Related tags

Factorial NotationPermutations And CombinationsFactorial SimplificationAlgebraic FactorisationClass 11MathematicsClass 11 Mcq

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