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What is the value of \(\frac{5!,3!}{2!,4!}\)?

Answer and explanation

Correct answer: 15

Taking the commas in the given expression to indicate multiplication, \(\frac{5!\times3!}{2!\times4!}=\frac{5!}{4!}\times\frac{3!}{2!}=5\times3=15\). Therefore, the correct answer is 15. Option 20 can result from incorrect cancellation of factorial terms. Exam tip: simplify matching factorials quickly using \(\frac{n!}{(n-1)!}=n\).

Related tags

Factorial NotationFactorial SimplificationPermutations And CombinationsClass 11 MathematicsMathematicsClass 11 Mcq

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