Question

A gum ball machine contains 12 red, 13 green, and 8 yellow gum balls. What is the

least number of gum balls Jack has to buy to be certain he gets 6 gum balls that are
the same color?

Answer 1

It's 16

Explanation:

Imagine taking out 5 reds, after that 5 green ones and then 5 yellow gum balls. So the 16th must be number 6 of any color.

Answer 2

Jack would have to buy 18 gum balls to be certain he gets 6 gum balls that are the same color.