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JEE Main Mathematics question

MathematicsPermutations and CombinationsJEE Main

A student is allowed to select at most books from a collection of books. If the total number of ways in which he can select at least one book is , then the value of is equal to

Answer: (B)

Solution

The number of ways is , which is half of by symmetry of the binomial

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Question ID VK-020558