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JEE Main Mathematics question

MathematicsBinomial TheoremJEE Main

is equal to

Answer: (D)

Solution

Group the terms as \left({}^nC_r+{}^nC_{r-1}\right)+\left({}^nC_{r-1}+{}^nC_{r-2}\right)={}^{n+1}C_r+{}^{n+1}C_{r-1}. By Pascal's

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Question ID VK-020809