SETInan AP, Sn=n2, what is tn ?(A) 2n(C) 2n+1(B) 2n-1(D)2n + 3 – InterviewSolution

1.

SETInan AP, Sn=n2, what is tn ?(A) 2n(C) 2n+1(B) 2n-1(D)2n + 3

Answer»

Given,Sn = n^2

Then,Tn = Sn - Sn-1 = n^2 - (n - 1)^2 = n^2 - n^2 - 1 + 2n = 2n - 1

(B) is correct option

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