The horizontal value in a pair of coordinates: how far along the point is. The X Coordinate is always written first in an ordered pair of coordinates (x,y), such as (12,5). In this example, the value "12" is the X Coordinate. Also called "Abscissa" See: Coordinates.
25 balls, 13 are odd
first pick = 13/25 probability of picking an odd
2nd pick = 12/24 = 1/2 probability
13/25 x 1/2 = 13/50 probability
