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posted by drew on Tuesday, March 5, 2013 at 9:20pm.
Find S10 for 2 + 5 + 8 +... A. 155 B. 152 C. 255 D. 135 I say A.
You have an arithmetic series where a = 2, d = 3, n = 10 sum(10) = (10/2)(4 + 9(3)) = 5(31) = 155 looks like you are right.
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