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Mathematics 11 Online
OpenStudy (richley):

Need help with ∑ notation! 4 Problems!

OpenStudy (richley):

OpenStudy (richley):

The options for this problem are: -410 -385 385 410

OpenStudy (richley):

I somehow got an answer in the thousands.

OpenStudy (yagosik):

Do you know the formula for the arithmetic progression?

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