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Find the indicated sum for the arithmetic series. S18 for 13 + 2 + (-9) + (-20) + ...

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13 + (18 - 1) -11 s18 = -174
That is not an option :/ the only options are -873, -1528, -256, and -1449
hmm thats strange

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Yeah, Thanks anyways though. I appreciate it greatly.
are you sure you typed the question correctly? if i understand correctly your looking for the 18th term?
No, I'm looking for the sum of the series to the 18th term
ok let me work it out give me a moment
Take your time
Thank you :)
remember to click good answer Megan :p
your welcome

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