03-08-2016
Mathematics

contestada

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

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Edufirst Edufirst

17-08-2016

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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