marble word problems...grrrr

Question

need help on this one!....there's a jar of marbles, containing red, blue, yellow, black, and white marbles. How many marbles must you draw (without looking), from the jar to be sure of getting at least three of one color?

Answer 1

In the worst case you would pull out 2 of each color, which means 10 total, without getting three of a kind. But since you would then have 2 of each color, then no matter what color you picked on the 11th draw, you would have three of one color. Answer: 11