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प्रश्न
A bag contains 5 black, 7 red and 3 white balls. A ball is drawn from the bag at random. Find the probability that the ball drawn is not black.
बेरीज
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उत्तर
Total no. of possible outcomes = 15 {5 black, 7 red and 3 white balls}
E ⟶ event of drawing black ball
No. of favourable outcomes = 5 {5 black balls}
P (E) = `5/15`
= `1/3`
`barE` ⟶ event of not drawing black ball
`P (barE)= 1 - P(E)`
= `1 - (1/3)`
= `2/3`
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