hunterjack1206 hunterjack1206

07-08-2018
Mathematics

contestada

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

Respuesta :

07-08-2018

[tex] = \frac{ - 4( - 6) {}^{7} - 1 }{ 1 + 6} [/tex]
[tex] = \frac{ - 4( - 279936) - 1}{7} [/tex]
[tex] = \frac{1119744 - 1}{7} [/tex]
[tex] = \frac{1119743}{7} [/tex]
[tex] = 159963[/tex]

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