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posted by elito on Thursday, June 28, 2012 at 10:04am.
Find the sum of the first 27 terms of the following sequence: 10, 18, 26 . . .
For an AS Sum(n) = (n/2)(2a + d(n-1)) in your case Sum(27) = (27/2)(20 + 26(8) ) = ...
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