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OpenStudy (sleepyjess):
Why did I get this wrong? Write the sum using summation notation, assuming the suggested pattern continues. 2 - 12 + 72 - 432 + ... http://prntscr.com/70q767
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OpenStudy (sleepyjess):
@amistre64
OpenStudy (anonymous):
mhm is c what you guess it is>?
OpenStudy (anonymous):
We multiply -6 to get from term to term. (Hence, this series is geometric.) So, this equals Σ(n = 1 to ∞) 2 * (-6)^(n-1).
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