MathDB

Box A contains

3

black and

4

blue marbles. Box B has

7

black and

1

blue, whereas Box C has

2

black,

3

blue and

1

green marble. I close my eyes and pick two marbles from

2

different boxes. If it turns out that I get

1

black and

1

blue marble, what is the probability that the black marble is from box A and the blue one is from C?

43