the sum of the n terms of an ap is 3n^2 +5n find the ap hence find its 16th term
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find Sn-1
then
an=Sn-Sn-1
then find a1 A2 a3
and then find 16 th term
then
an=Sn-Sn-1
then find a1 A2 a3
and then find 16 th term
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