SOLUTION: how many terms of the series -9,-6,-3, ....will be 66?

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Question 1091788: how many terms of the series -9,-6,-3, ....will be 66?
Answer by Fombitz(32388)   (Show Source): You can put this solution on YOUR website!
I'm assuming you mean they will sum to 66.


So then,







n must be a positive integer so,



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