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OpenStudy (anonymous):
The sum of the first 6 terms of the geometric sequence 1, -2, 4, -8, ... is?
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OpenStudy (anonymous):
multiply your sequence by -2 each time. (1*-2) =-2 -2*-2=4 4*-2= -8 -8*-2= 16 16*-2= -32 now you can do the sum
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