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February 27, 2015

February 27, 2015

Posted by **Gloria** on Monday, June 11, 2012 at 9:07am.

- math -
**Pendergast**, Monday, June 11, 2012 at 10:56amsum of first 5 natural numbers = (5)(6)/2

sum of first 21 natural numbers = (21)(22)/2

sum of first 30 natural numbers = 465 = (30)(31)/2

sum of first n natural numbers = (n)(n+1)/2 -- provable by induction

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