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Mathematics 10 Online
OpenStudy (anonymous):

Once again, I have a question on arithmetic series. I really need help. Previous questions have all been ignored. Attachment below.

OpenStudy (anonymous):

So, I just went up to my teacher to ask how to do this, and she explained it, but then I got confused again... Can someone explain to me how to solve this?

hartnn (hartnn):

Do you know the formula for sum of arithmetic series ?

OpenStudy (anonymous):

Yes.

OpenStudy (anonymous):

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