algebra
posted by drew .
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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