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Question
A bag contains 5 red, 8 white and 7 black balls. A ball is drawn at random from the bag. Find the probability that the drawn ball is not black
Solution
Total no. of possible outcomes = 20 {5 red, 8 white & 7 black}
Let E ⟶ be event of getting black ball
No. of favourable outcomes = 7 {7 blackl}
Probability, P(E) =`"No.of favorable outcomes"/"Total no.of possible outcomes"`
P(E) = 7/20
(`barE` )⟶ event of not getting black ball
𝑃(`barE` ) = 1 – P(E)
= 1 − 7/20 =13/20
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