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12 August, 08:04

Find the 10th partial sum of the summation of negative 5i plus 2, from i equals 1 to infinity.

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  1. 12 August, 08:24
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    Sum of { (-5i + 2) from i = 1 to 10} =

    = - 5{ (Sum i) from 1 to 10} + (sum of 2) from 1 to 10

    = - 5 {1 + 10) * 10/2} + 2{10} =

    = - 5 (11) (5) + 20 = - 275 + 20 = - 255
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