Answer to Question #21891 in Calculus for Kevin
term is a1, the common difference is d, and the number of terms is n.
an = a1 + (n – 1)d
the sum of an arithmeticprogression is equal to
Sn = (n/2)(a1+an)
Sn = n/2 * (2*a1+d(n-1))
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