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What is the value of \( \frac{19!}{16!}-\frac{18!}{15!} \)?

Answer and explanation

Correct answer: 918

\(\frac{19!}{16!}=17\times18\times19\) and \(\frac{18!}{15!}=16\times17\times18\). Therefore, the expression becomes \(17\times18\times(19-16)=17\times18\times3=918\). Hence, 918 is correct. A value such as 1026 may result from incorrect cancellation or subtraction. Exam tip: In factorial fractions, cancel the smaller factorial first, then factor out common consecutive terms where possible.

Related tags

Factorial NotationFactorial SimplificationPermutations And CombinationsClass 11 MathematicsArithmetic EvaluationMathematicsClass 11 Mcq

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