In his pocket, a boy has 3 red marbles, 6 blue marbles, and 6 green marbles. How many will he have to take out of his pocket to ensure that he has taken out at least one of each color?  Choose the correct option:  A) 12  B) 13  C) 14  D) 15  E) 16
The worst case scenario would be that he has taken 6 blue and 6 green, a total of 12 marbles, and still doesn't have 3 distinct colors. But the next draw, marble number 13, will surely be red as only the red marbles are left in his pocket.   The answer is 13.
<result>B</result>
In his pocket, a boy has 3 red marbles, 6 blue marbles, and 6 green marbles. How many will he have to take out of his pocket to ensure that he has taken out at least one of each color?