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OpenStudy (anonymous):
Which of the following is the formula for the geometric sequence? 8, -16, 32, -64
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OpenStudy (anonymous):
a = 8 r = -2 For last term: \[\large T_n = a.r^{n-1}\]
OpenStudy (anonymous):
i dont get it ?
OpenStudy (anonymous):
an = 8(-2)n-1
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