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You have balls of four color (red blue green yellow). There are 10 balls for each color. They are randomly distributed in 4 boxes. You can pick any ball from any container (obviously you won't know the color of ball till you take it out) What is the minimum number of balls you have to pick to make sure you have two balls of the same color?
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Software Development Manager

Interviewed at Amazon

3.5★
Dec 12, 2010

You have balls of four color (red blue green yellow). There are 10 balls for each color. They are randomly distributed in 4 boxes. You can pick any ball from any container (obviously you won't know the color of ball till you take it out) What is the minimum number of balls you have to pick to make sure you have two balls of the same color?

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