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March 26, 2015

March 26, 2015

Posted by **Sandy** on Monday, October 14, 2013 at 5:17pm.

1,3,6, I figured out 10 is the next number

Rule: find the difference and add 1 to the next item

- Math -
**Steve**, Monday, October 14, 2013 at 5:19pmcorrect.

Tn = 1+2+3+...+n = n(n+1)/2

- Math -
**Sandy**, Monday, October 14, 2013 at 5:19pmThank you

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