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JEE Main Mathematics question

MathematicsPermutations and CombinationsJEE Main

If denotes the number of permutations of things taken all at a time, the number of permutations of things taken at a time and the number of permutations of things taken all at a time such that , then the value of is

Answer: (B)

Solution

, and , so .

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Question ID VK-020618