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A bag contains 12 green balls …

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A bag contains 12 green balls and x black balls. If one ball is drawn at random from the bag,what is the probability of getting a black ball. If 2 red balls are put in the bag and 2 black balls are taken out of the bag, the probabilty if drawing a black balls is now two third of what it was before. Find x

Posted by Komal Gupta 4 years, 9 months ago

CBSE > Class 10 > Mathematics

1 answers

Subham Gite 4 years, 9 months ago

A bag conatin two green ball Red Ball A red Ball of the bag ball No of the favourable outcome Total No of outcome 2÷12 = 6 Black ball a black ball has No of favorable outcome Total No of outcome 2_12 = 6 Green ball A bag contain 12 green ball No of favourable outcome Total no of outcome 12_12 = 1

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