Question

A box-contains 3 blue and 2 red marbles while another box contains 2

blue and 5 red marldes. A marble drawn at random from one of the boxes
turns out to be blue. what is the probability that it came from the first box?
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Answer 1

3/5

Explanation:

(3/5) · (1/2) over (3/5) · (1/2) + (2/5) · (1/2)

= 3/5