An=a+nd is there any formula?
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no I don't think so
but ha..
An= A + (n-1)d is there
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An arithmetic sequence can be defined by an explicit formula in which an = d (n - 1) + c, where d is the common difference between consecutive terms, and c = a1. ... Then, the sum of the first n terms of an arithmetic sequence is Sn = na1 + (dn - d ).
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