Posted by kapil on .
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 
Himadri Mukherjee,
19

math 
aaron,
which of the numbers below is the sum of four consecutive whole numbers