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OpenStudy (anonymous):
What is the sum of the geometric sequence 1, –4, 16, … if there are 7 terms?
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OpenStudy (callisto):
a=1 r=-4 n=7 use the formula in ur previous post and calculate the answer
OpenStudy (callisto):
r=-4/1 = -4
OpenStudy (callisto):
answer = 3277
OpenStudy (anonymous):
That's correct! = [( -4)^7 -1 ] / -5 = 3277
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