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A box has 5 blue and 4 red balls. One ba...

A box has 5 blue and 4 red balls. One ball is drawn at random and not replaced. Its colour is also not noted. Then, another ball is drawn at random. What is the probability of second ball being blue?

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To solve the problem step by step, we will use the concept of conditional probability and the law of total probability. ### Step 1: Identify the Events We have two events: - \( E_1 \): The first ball drawn is blue. - \( E_2 \): The first ball drawn is red. - \( E \): The second ball drawn is blue. ...
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