Bag A contains 2 white and 3 black balls. Bag B contains 5 white and 4 black balls. One ball is drawn at random from Bag B and is placed unseen in Bag A. a) What is the probability that a ball now drawn from Bag A is black? b) If the ball drawn from Bag A is black, find the probability that a white ball is transferred from Bag B into Bag A. c) If the ball drawn from Bag A is white, find the probability that a black ball was transferred from Bag B into Bag A

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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Bag A contains 2 white and 3 black balls. Bag B contains 5 white and 4 black balls. One ball is drawn at random from Bag B and is placed unseen in Bag A.

a) What is the probability that a ball now drawn from Bag A is black?

b) If the ball drawn from Bag A is black, find the probability that a white ball is transferred from Bag B into Bag A.

c) If the ball drawn from Bag A is white, find the probability that a black ball was transferred from Bag B into Bag A

Expert Solution
Step 1

Given that,

Bag A contains 2 white and 3 black balls.

Bag B contains 5 white and 4 black balls.

The event Ab  is drawing a black ball from bag A

The event Aw  is drawing a white ball from bag A

The event Bw is drawing a white ball from bag B

The event Bb is drawing a black ball from the bag B

The probability is the ratio of number of favorable outcomes of the event to the total number of outcomes.

The conditional probability for two events A and B is as follows,

P(A|B)=P(AB)P(B)

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