if the sum of n terms of an AP is given by Sn=(3nsquare+4n), find its rth term.

Asked by  | 24th Aug, 2012, 07:48: PM

Expert Answer:

Sn = 3n2 + 4n
We know nth term is given by an = Sn - Sn-1
Thus, rth term is ar = Sr - Sr-1
Now, substitute the value of Sr and Sr-1 to get the rth term
 

Answered by  | 24th Aug, 2012, 10:46: PM

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