In his pocket, a boy has 3 red marbles, 4 blue marbles, and 4 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?
A. 3
B. 7
C. 8
D. 9
E. 11

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Please don't give answer only, explanation needed also

Do I have to do probability?

Hmm...well if he took all the red and blue marbles, then the next one he picks has to be green!

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