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A gumball machine that randomly dispenses one gumball at a time contains 13 red, 5 blue, 1 white, and 9 green gumballs. What is the least number of gumballs that Wally must buy to guarantee that he receives 3 gumballs of the same colour?

 Jun 17, 2020
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If you have 7 gumballs, they might consist of 2 red, 2 blue, 1 white, and 2 green.

The eighth gumball must be the third of a color.

 Jun 17, 2020

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