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A bag contains white, black and red balls only. A ball is drawn atrandom from the bag. If the probability of getting a white ball is 10and that of a black ball is 25 then find the probability of getting a redball. If the bag contains 20 black balls, then find the total number ofballs in the bag.CBSE 2015 |
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Answer» P(of red ball)= 1-(3/10+2/5)= 1-(3+4/10)= 1-7/10= 10-7/10P(of red ball)=3/10No of black balls=> 20/total no.of balls=2/5=>50=Total no.of ballsNo.of red balls=>3/10=No.of red balls/5015=No.of red ballsNo.of white balls=>3/10=No.of white balls/5015=No.of white balls |
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