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

Answer and explanation

Correct answer: 1365

Cancelling \(11!\) from \(15!\) gives \(\frac{15!}{11!\cdot4!}=\frac{15\times14\times13\times12}{4\times3\times2\times1}\). Simplifying this expression gives \(1365\). The value \(1820\) is \(\binom{16}{4}\), so it does not apply here. Exam tip: use \(\frac{n!}{r!(n-r)!}=\binom{n}{r}\); here the expression is \(\binom{15}{4}\).

Related tags

Factorial NotationBinomial CoefficientPermutations And CombinationsFactorial SimplificationClass 11 MathematicsMathematicsClass 11 Mcq

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