Find the sum of first 30 terms of an AP whose nth term is 2-3n
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given tn=2-3n
t1=-1
t30=2-3 (30)=-88
sum of 30 term=30/2{ (-1)+(-88)}
=15x (-89)
t1=-1
t30=2-3 (30)=-88
sum of 30 term=30/2{ (-1)+(-88)}
=15x (-89)
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