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JEE Main Mathematics question

MathematicsBinomial TheoremJEE Main

If denotes the number of combinations of things takes at a time, then the expression , equals

Answer: (B)

Solution

Group the terms as \left({}^nC_{r+1}+{}^nC_r\right)+\left({}^nC_r+{}^nC_{r-1}\right). By

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Question ID VK-020544