Question
Fri August 24, 2012 By:
 

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

Expert Reply
Fri August 24, 2012
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
 
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