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26 October, 07:07

Use the summation formula to find a partial sum of a series with the following properties

Geometric

a1 = - 11

a7 = - 45,056

n = 7

r = - 4

+2
Answers (1)
  1. 26 October, 07:16
    0
    -36,047.

    Step-by-step explanation:

    Sum of n terms = a1. (r^n - 1) / (r - 1)

    So Sum of 7 terms = - 11. ((-4) ^7 - 1 / (-4-1)

    = - 11 * - 16,385 / - 5

    = - 36,047.
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