Separate them by colour
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8:6
0No blue marbles in the bag.
It is 1248/57120 = 13/595 = 0.0218 approx.
5/10
There are 11+10+17+15+3=56 marbles in total. Of those marbles, 11 are blue and 17 are red, so there are 11+17=28 blue and red marbles. Therefore the probability of choosing a blue or red marble is 28/56=.5, or 50%.