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posted by Kevin Tuesday, May 22, 2012 at 3:04pm.

Find S(sub 73) for the arithmetic series 4 + 7 +10....

you have a AS where a = 4, d = 3 and n = 73 sum(73) = (73/2)(2(4) + 72(3)) = (73/2)( 224) = 8176

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