Black * * * *
Green * * *
White * * *
In order for 4 red marbles to be one-third of a group and 3 blue marbles to make up one-fourth of the same group the number has to equal 12.
5 marbles
The first could be white, the second could also be white, but for the third there are no white left so the third would have to be black. The first or second could be black, but to guarantee at least one black you need to remove 3 marbles.
I think the trading is the other way around and then the answer is 18 marbles in all.
18 of them.
minus one red marble plus one blue marble
The second and third marbles depend upon the first, so they are dependent. Even if they are all being drawn together, because there is no replacement, each removal affects the original group of marbles.
15
The third Olympic medal color is bronse.
I think red is the third most popular color.
My third favorite color is purple what's yours? --------------------------------------------------------- My favorite color is red, my second favorite color is white, and I don't have a third favorite color! Hehe!
8 i think 8 i think I guess it's 6.. and my point is that you have to try it through the worst sequence ever. starting with the red one (the one that is impossible for you to get another one, and will never reach the three same colored wanted) then start getting one of each of the two other colors each time, alternating, so it will take longer for you to have several of the same color: example: red > black > white > black > white > black (3 black ones) or red > white > black > white > black > white (3 white ones) or (just to prove that alternate sequence isn't needed) white > black > black > red > white > (...) (impossible to get any marble without getting the third of it's color, and by not getting the red one, this would have been impossible to reach, so to be SURE, you have to count this one in the first five, or it would come or not in the 5th position) in this case, a longer sequence would have got the three equal-colored marbles some time ago. remembering, that this sequence is just to explain that 6 would do the job, and these balls would have been caught in a handful of marbles =) ps.:sorry for my poor English.