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OpenStudy (anonymous):
1-2+4-8+...-a10
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OpenStudy (anonymous):
What are we suppose to solve?
OpenStudy (anonymous):
it say use the formula to evaluate the series
OpenStudy (watchmath):
r=-2 So the sum is \[1(1-(-2)^{10})/(1-(-2) )=\frac{-1023}{3}\]
OpenStudy (anonymous):
one.. the other one was all postive numbers.. this one have both
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