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posted by drew on Tuesday, March 5, 2013 at 9:25pm.

Find S10 for (-1) + (-7) + (-13) + (-19) +... A. 250 B. -280 C. (-23) D. 132 C.

a = -1 d = -6 n = 10 sum(10) = (10/2)(-2 + 9(-6)) = 5(-56) = -280 looks like B)

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