Worse case scenario is keeps taking the most common colours and none of the rarest leading to selecting 4 white and 5 blue.
Plus 1 red to get one of each colour
a bag contains 3 red, 4 white, and 5 blue marbles. Jason begins removing marbles from the bag at random, one at a time. What is the least number of marbles he must remove to be sure that he has at least 1 marble of each color?
I thank you all in advance,