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JEE Advanced Mathematics question

MathematicsSequence and SeriesJEE Advanced

Let denote the sum of the first terms of an AP. If then is equal to

Answer: (B)

Solution

gives

n\{2a+(2n-1)d\}=\{2a+(n-1)d\}ā‡’ 4a+(4n-2)d=6a+(3n-3)dā‡’ 2a=(n+1)d.

Then

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Question ID VK-107808