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What is the simplified value of \( \frac{15!}{11!\cdot4!}\div\frac{14!}{10!\cdot4!} \)?

Answer and explanation

Correct answer: \( \frac{15}{11} \)

The expression is \(\frac{15!}{11!\cdot4!}\times\frac{10!\cdot4!}{14!}\). After cancelling \(4!\), it becomes \(\frac{15!\cdot10!}{11!\cdot14!}\). Using \(15!=15\cdot14!\) and \(11!=11\cdot10!\), all common factors cancel and the value is \(\frac{15}{11}\). \(\frac{14}{11}\) could result from incorrectly omitting the extra factor 15 in \(15!\). Exam tip: Expand factorials only as far as needed to cancel common factorial terms.

Related tags

Factorial NotationFactorial SimplificationPermutations And CombinationsClass 11 MathematicsMathematicsClass 11 Mcq

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