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Class 11 Mathematics Permutations and Combinations Factorial notationMedium

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What is the value of (\frac{13!}{11!}-\frac{10!}{8!})?

Answer and explanation

Correct answer: (66)

(\frac{13!}{11!}=13\times12=156) and (\frac{10!}{8!}=10\times9=90), so the difference is (66). Simplify both factorial ratios separately first.

Related tags

Factorial Notation Permutations Combinations Class 11 Medium Factorial Notation Permutations And Combinations Mathematics Class 11 Mcq

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