Q. 145.0( 2 Votes )

A bag contains 4 white, 7 black 5 red balls. Three balls are drawn one after the other without replacement. Find the probability that the balls drawn are white, black and red respectively.

Answer :

There are 4 white, 7 black and 5 red balls in the bag, so the number of all favorable outcomes in the sample space is


n(S) = 4+7+5=16


Let A be the event of getting a white ball in the first draw. Hence the probability becomes


(as there are 4 white balls out of 16 balls)


Let B represents the event of getting a black ball in the second draw. Hence the probability becomes


(as there are 7 black balls out of 15 balls as balls are not replaced back in the bag)


Let C represents the event of getting a red ball in the third draw. Hence the probability becomes


(as there are 5 red balls out of 14 balls as balls are not replaced back in the bag)


Then the probability that the balls drawn are white, black and red respectively without replacement






Hence the required probability is


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