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JEE Advanced Mathematics question

MathematicsBinomial TheoremJEE Advanced

The sum is equal to

Answer: (A)

Solution

Note the upper limit is , not . Using :

r {}^{2n}=2n({}^{2n-1}+{}^{2n-1}++{}^{2n-1}.

The bracket is the first half of t

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Question ID VK-108352