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January 27, 2015

January 27, 2015

Posted by **Rocky** on Thursday, March 22, 2012 at 1:48am.

-20 - 18 - 15 - 11 …

I think it is both arithmetic and geometric

- math -
**Damon**, Thursday, March 22, 2012 at 4:37amdifferences of 2 , 3 , 4 so not arithmetic

-20

**** +2

-18

**** +3

-15

**** +4

-11

is it of form g + g r + g r^2 ....+gr^(n-1) ?

-20 ( 1 + r + r^2 + .... r^(n-1) ) ?

no way

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