Math

A bag contains 33 balls: 10 blue 11 red and 12 green

If a person will select balls at random from the bag without replacement, what is the minimum number of balls needed to be selected in order to be sure that the balls selected include 3 balls of the same color

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1. There are only 3 colors. So, after 6 draws, it is possible to have two of each color.

The 7th ball must be the one which matches two of the others.

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posted by Steve

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