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JEE Advanced Mathematics question

MathematicsBasic Mathematics and LogarithmJEE Advanced

The value of is

Answer: (C)

Solution

{(2n-1) a-(m-1) b}= a(2n-1)-m(m-1) b= a-m(m-1) b,

using . Now

Missing argument for \frac\frac m2

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Question ID VK-107843