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3 out of 13 or 3/13
The theoretical probability of randomly picking each color marble is the number of color marbles you have for each color, divided by the total number of marbles. For example, the probability of selecting a red marble is 3/20.
None, if all the marbles that you have are yellow!
0No blue marbles in the bag.
It would help if the number of blue disks - or a letter to represent that number - were given.