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January 26, 2015

January 26, 2015

Posted by **Carlee** on Tuesday, January 11, 2011 at 2:35pm.

- math -
**Ms. Sue**, Tuesday, January 11, 2011 at 2:37pm**Please do not switch names -- as you've done for the last ten posts.**

- math -
**tchrwill**, Tuesday, January 11, 2011 at 7:03pmLines....Intersections

..1...........0

..2...........1

..3...........3

..4...........6

..5..........10

or N = n(n - 1)/2

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