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Class 11 Mathematics Permutations and Combinations Factorial notationHard

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What is the value of ( \frac{10!}{7!}-\frac{9!}{6!} )?

Answer and explanation

Correct answer: (288)

The first value is (10\cdot9\cdot8=720) and the second is (9\cdot8\cdot7=504), so (720-504=216). Check subtraction carefully after expansion.

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

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