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Class 11 Mathematics Permutations and Combinations Factorial notationHard

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What is the value of ( \frac{21!}{19!\cdot2!}-\frac{20!}{18!\cdot2!} )?

Answer and explanation

Correct answer: (20)

The first term is (210) and the second is (190), so the difference is (20). Subtract nearby terms carefully.

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

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