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in Introduction to Probability Theory by (49.1k points)
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There are two identical boxes containing respectively 5 white and 3 red balls, 4 white and 6 red balls. A box is chosen at random and a ball is drawn from it 

(i) find the probability that the ball is white 

(ii) if the ball is white, what is the probability that it from the first box?

1 Answer

+1 vote
by (46.9k points)
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Best answer

Let A1 be the event of selecting the first box and A2 be the event of selecting the second box. Let B be the event of selecting a white ball.

Now

(i) P(B) 

(ii) P(A1/B) 

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