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Since each of the three colours has an equal chance of being drawn, theoretically if you draw four marbles from the bag, you should have at leas two of the same colour.

However, there is a 1/3 (33.33%) chance that the first two marbles you pull out will be the same color. There is just a guarantee that you will have two of at least one color after pulling out four.

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Q: A bag has 6 marbles in iteach marble is either rad blu or green what is the least number of marbles that you must pull ou of the bag to be sure you have two marble the same color?
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