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What is the value of \(\frac{19!}{17!}-\frac{18!}{16!}\)?

Answer and explanation

Correct answer: 36

Since \(19! = 19\times18\times17!\), \(\frac{19!}{17!}=19\times18\). Similarly, \(18!=18\times17\times16!\), so \(\frac{18!}{16!}=18\times17\). Therefore, the value is \(19\times18-18\times17=18(19-17)=36\). The nearby value 34 may result from incorrect cancellation of factorial terms. Exam tip: Expand a factorial only up to the smaller factorial before cancelling common factors.

Related tags

Factorial NotationFactorial SimplificationPermutations And CombinationsAlgebraic SimplificationMathematicsClass 11 Mcq

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