Posted by Urgent pls help on Monday, March 18, 2013 at 2:56am.
A cube has 8 vertices. For each pair of distinct vertices, we connect them up with a line segment. There are
(8)
(2) =28
such line segments. For each of these 28 line segments, we mark the midpoint. How many distinct points have been marked as the midpoints?

Math Geometry  Kishan, Saturday, March 23, 2013 at 11:17pm
19
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