Doubt from sequence and series

ques 51

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i m not getting what to find out
a=5 b=3 now put u will get ans

Please explain how you solved that expression

wait let me write i m not getting latex..

missing close brace

pls recheck it,i think something's seriously wrong with your soln...

yep u r right himanshu i was in hurry i write this time only i sorry

no problem..

this correct
its was \sqrt{n+1)/2}

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have u solved this question anytime before?


how did the idea to solve it like this hit u ?

I understood...thanks

@Achyut_2020 what is the source of the question.

Bro its RTPF advance fiitjee