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OpenStudy (anonymous):
What is the sum of the geometric sequence -4, 24, -144, ... if there are 6 terms? -159,963 26,660 26,661 159,963
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OpenStudy (anonymous):
a=First term=-4 ,r = common ratio =-6 , n=number of all terms =6 Use the Rule :\[\huge Sn=\frac{a(1-r^n)}{1-r}\]
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