Sum of first n terms of an ap is given by sn=2nsquare+3n find the 16th

1.	Sum of first n terms of an ap is given by sn=2nsquare+3n find the 16th termof the ap
Answer» Apply the formula Sn=Sn- Sn-1 Sn=2n²+3n S1=2+3 a =5S2=2×2²+3×2a+a+d=142×5+d=14d=14-10d=4A16=a+15d =5+15×4 =5+60 =65 65........?

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