A bag contains 3 red marbles, 5 blue marbles and 4 green marbles. If three marbles are drawn out of the bag, what is the exact probability that all three marbles drawn will be blue ?

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Answer:

Step-by-step explanation:

3 red

5 blue

4 green

12 marbles

pro(all blue) =3/12

                    =1/4

                    =0.25