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2 January, 22:17

What is the sum of the first 6 terms of the series

-1+4-16 + ...

+5
Answers (1)
  1. 2 January, 22:25
    0
    819

    Step-by-step explanation:

    Givens

    a = - 1 r = - 4 n = 6

    Formula

    Sum = a (1 - r^n) / (1 - r)

    Sum = - 1 (1 - (-4) ^6 / (1 - - 4)

    Sum = - 1 (1 - 4096) / 5

    Sum = - 1 ( - 4095) / 5

    Sum = 819
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