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October 23, 2014

October 23, 2014

Posted by **mary** on Sunday, April 18, 2010 at 3:24pm.

- math -
**Reiny**, Sunday, April 18, 2010 at 3:37pmlooks like an arithmetic series where

a = 10, d=2 and n=30

sum(30) = (30/2)[2(10) + (29)(2)]

= 15[20+58] = 1170

(using the standard formula for the sum of n terms)

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