Hi guys, i have 2 problems on arithmetic/geometric series. Any help would be appreciated!

1. Find x so that x-1, x, x+2 are consecutive terms of a geometric series.

2. Find: n $\displaystyle E$ k=1 (1+2k)

Thanks!!

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- Dec 10th 2008, 01:27 PMDijakinArithmetic / Geometric series HELP!
Hi guys, i have 2 problems on arithmetic/geometric series. Any help would be appreciated!

1. Find x so that x-1, x, x+2 are consecutive terms of a geometric series.

2. Find: n $\displaystyle E$ k=1 (1+2k)

Thanks!! - Dec 10th 2008, 01:59 PMskeeter