The sum of the series a-(a+d)+(a+2d)-(a+...

The sum of the series `a-(a+d)+(a+2d)-(a+3d)+...` up to `(2n+1)` terms is: a. `-n d`. b. `a+2n d`. c. `a+n d`. d. `2n d`

` a+ an`

2nd

`a + nd`

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