Arithmetic Ability
 Probability

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Q.

A bag contains 3 black, 4 white and 5 red balls. One ball is drawn at random. Find the probability that it is either black or red ball:

View Answer

Correct choice: A

Explanation:

P(black ball)=3/12 P(red ball)=5/12 P(black or red)=3/12+5/12=2/3
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