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--- dtiwari
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There is some square root of r+1 in there.
At the beginning i also thought it should be a typo, but in this case the sum would make no sense for r=1, so there should be two typos...
Which is the source of the problem?
--- df (gauss)
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Thanks gigelmarga, To Admin actually it is from mock test paper for Jee Advanced.
and i have typed it wrongly . Thanks for clearfy me.
--- dtiwari
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