Question

Box contains 4 red balls and 5 blue balls. A ball is randomly drawn from 2 points box. What is the probability that ball is red.​

Answer 1

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Answer 2

Let E1 is the event that first ball drawn is blue, E2 be the event that first ball drawn is red and E is the event that second ball drawn is blue.

Therefore,

P(E)=P(E1)P(E∣E1)+P(E2)P(E∣E2)

=95.84+94.85=7240=95