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Mathematics 15 Online
OpenStudy (anonymous):

is this sequence arithmetic or geometric? 9, -36, 144, -576

OpenStudy (amistre64):

its switches signs so most likely it geometric

OpenStudy (amistre64):

just a cursory glance tho

OpenStudy (anonymous):

times by -3

OpenStudy (anonymous):

no -4 each time

OpenStudy (amistre64):

9*-3 = -36?

OpenStudy (amistre64):

:)

OpenStudy (anonymous):

thanks guys

OpenStudy (amistre64):

i just recenly learned the difference myself :) geometric series have a constant term that is multiplied; arithmetic is well.. a constant theat is added

OpenStudy (anonymous):

idea is simple, just divide one term by the previous one. if the answer is a constant it is geometric.

OpenStudy (amistre64):

........ now why dint i think of that lol...

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