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12 July, 12:43

Find the sum of the geometric sequence - 3, 15, - 75, 375, ... when there are 7 terms and select the correct answer below.

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  1. 12 July, 13:01
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    -3, 15, - 75, 375, ...

    *5 * 5 * 5

    aⁿ = a₁rⁿ⁻¹

    aⁿ = 3 (5) ⁿ⁻¹

    a₅ = - 1875

    a₆ = 9375

    a₇ = - 46875
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