find the sum of the first 19 terms of ap where nth term is 2n+1/3
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put n=1,
a1=2x1+1/3
=7/3
put n=2,a2=2x2+1/3=13/3
it forms a.p=7/3,13/3....
a=7/3
d=13-7/3=6/3=2
a19=a+(19-1)d
7/3+18(2)
115/3
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