Posted by jack on .
In an urn, there are several colored balls, with equal numbers of each color. We add 14 balls which are all of the same new color, that is different from those in the urn. It is calculated that the probability of drawing , without replacement, two balls of the same color is constant. How many balls are there in the urn initially?

math 
Correct Answer!!!,
144

math 
...actual right answer,
254