This question is actually from this years JEE Advance. The picture is of the sloution provided by this site. Can't really understand it. Please help out. I am in 11 so I may not be aware of the formula used or am just missing something. Sigma means adding but I somehow don't see that happening. Is there a shortcut or furmula for that?? Thanks!!

Question

Ajay · Answer

Hi Ellish Try to sum by putting k =1 to 13 , you see that that only first and last term r emain while the terms in the middle get cancelled out.

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