The sum of n terms of an A.P. is 3n 2 +5n. Find the A.P. Hence, find its 16th term
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Answer:S1=8,S2=22,S3=42
Therefore the series is
8+14+20+...........
a=8,d=6,Tn=a+(n-1)d
T16=8+90=98
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