Use your knowledge of probability to solve this riddle.
A box contains 12 balls of three different colors.
4 each of red, yellow and blue.
If you were to be blindfolded and asked to pick them at random,
How many balls must you pull out to be sure that there are at least two of one color among the balls picked out?
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Answer: 4 Balls.
Explanation: You need to pick 4 balls. In the first three pickings you may get 1 of each color, on the 4th pick there must be at least two of one color.