What is the sum of the geometric sequence -4, 24, -144, ... if there are 7 terms? A: -159,964B: -26,661C: 26,661D: 159,963

asked Feb 28, 2019 20.2k views

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$= \frac{ - 4( - 6) {}^(7) - 1 }{ 1 + 6}$

= ( - 4( - 279936) - 1)/(7)

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