You have a bucket of jelly beans in three colors – red, green and blue. With your eyes closed, reach in the bucket and take out two jelly beans of the same color. How many jelly beans do you have to take to be certain of getting two of the same color?
Four. Pick just three jelly beans, and it's possible you'd have one of each color and therefore no match. With four jelly beans, at least two have to be the same color.
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