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JEE Advanced Mathematics question

MathematicsSequence and SeriesJEE Advanced

Let the th term, , of a series be given by . Then is

Answer: (C)

Solution

Factorise: . Since ,

=Missing argument for \frac\frac12ยท=Missing argument for \frac\frac12{Missing argument for \frac\frac1{-r+1}-Missing argument for \frac\frac1{+r+1}}.

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Question ID VK-109264