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प्रश्न
A bag contains 3 red balls and 5 black balls. A ball is draw at random from the bag. What is the probability that the ball drawn is not red?
उत्तर
A bag contains 3 red and 5 black balls and a ball is drawn at random from the bag
TO FIND: Probability of getting a
(i) red ball
(ii) not red ball
Total number of balls `3+5=8`
Probability of getting red ball `P (E)=3/8`
We know that sum of probability of occurrence of an event and probability of non occurrence of an event is 1.
`P(overlineE)+P(overlineE)=1`
`3/8+P(overlineE)=1`
`P(overlineE)=1-3/8`
`P(overlineE)=(8-3)/8=5/8`
Hence the probability of getting not red ball `P(overlineE)=5/8`
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