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OpenStudy (anonymous):
find the sum of the first terms in the geometric series-4+8-16+ a.-342 b.-1,020 c.-340 d.340
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OpenStudy (dtan5457):
"first terms" How many terms...?
OpenStudy (triciaal):
the first term a = -4 the ratio is -16/8 = 8/-4 = -2 the sum of the first n terms = a(1-r^n)/ (1-r) n is the number of terms
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