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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
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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

User Psbits
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1 Answer

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

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

= (1119744 - 1)/(7)

= (1119743)/(7)

= 159963

User Nikesh Kedlaya
by
9.1k points
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