There are 12 marbles in total in the bowl. From this bowl, we will choose 4 marbles at random. That's 12C4 or (12*11*10*9) or 11,880 ways
Out of this, what is the probability that there is exactly 1 blue marble. There are 5 blue balls but only 1 is selected, 5C1 ways The rest except blue calls are 7, but only 3 slots are left, 7C3 ways
The probably of exactly 1 blue of 4 marbles is then 5C1*7C3/12C4 = 1050/11,880 = 0.0884 or 8.84%
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