1. The first term of an arithmetic series is 1 . the common difference of the series is 6.Find the tenth term of the series if the sum of the first n terms of the series is 7400. Show that 3n^2-2n-7400=0
Given Sn=7400.S_n=7400.Sn=7400.
Since n≥0,n\ge 0,n≥0, we take n=50.n=50.n=50.
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