What is the sum of the first 8 terms of the series: -2 + 4 - 6 + 8 - 10 + ... ?

What is the sum of the first 8 terms of the series: -2 + 4 - 6 + 8 - 10 + ... ?

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This is no arithmetic progression... -.-

You just have to see the trend, it would seem...

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