There are 100 balls in a box. 20 are blue, 20 are red, 20 are black, and 20 are white and 20 orange. Find the least no of ways to get the pair of balls.
RE: There are 100 balls in a box. 20 are blue, 20 are ...
There are 5 different colored Balls in the bag. As a worst possible case let us assume that you pick up all 5 different colors in your first 5 picks. So the next time (6th pick) you pick up a ball you are absolutely sure that the ball would have one of the five colors. Now you can pair it with any one ball picked by you earlier. So the Answer is 6 ways.
