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algebra

posted by on .

Find S10 for 2 + 5 + 8 +...
A. 155
B. 152
C. 255
D. 135
I say A.

  • algebra - ,

    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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