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Class 11 Mathematics Permutations and Combinations Factorial notationHard

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What is the value of ( \frac{11!}{8!}-\frac{10!}{7!} )?

Answer and explanation

Correct answer: (360)

(11\cdot10\cdot9=990) and (10\cdot9\cdot8=720), so the difference is (270). Expand three consecutive factors.

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

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