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6 June, 09:00

Find the sum of the geometric sequence - 3,15,-75,375, ... when there are 9 terms

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  1. 6 June, 11:39
    0
    -976,563.

    Step-by-step explanation:

    The common ratio is 15/-3 = - 75/15 = 375/-75 = - 5.

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

    so S9 = - 3 * ((-5) ^9 - 1)) / (-5 - 1)

    = - 976,563.
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