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algebra

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Find S25 for (-7) + (-2) + 3 + 8 +...
A. 1,320
B. 1,325
C. 825
D. 820
I think A

  • algebra - ,

    I got 1325 or B)

    Sum(25) = (25/2)( -14 + 24(5))
    = (25/2)(106) = 1325

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