Q9: 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. 11

B. 7

C. 8

D. 9

how??

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- February 10th 2011, 10:52 PMbahadaraliMinimum number of marbles to have taken one of each colour.
Q9: 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. 11

B. 7

C. 8

D. 9

how?? - February 10th 2011, 11:07 PMearboth
- February 10th 2011, 11:09 PMpickslides
Well if the first 3 the took were red and the next 4 he took were blue, that would be seven, so the next one would have to be green and he would then have one of each colour.

But if he took 4 blue then 4 green the next one would be red and that would make 9.

The idea here is to add the 2 biggest numbers so there is no chance you can miss a colour.