Question

A bag contains 4 red bals, 6 green balls and 5 blue balls. If three balls are picked at random,
what is the probability that two of them are green and one of them is blue in colour?
(a) 20/21
(b) 10/91
(c) 15/91
(d) 5/91
(e) 25/91

Answer 1

1)number of total outcomes of getting green balls=6
number of possible outcomes of getting green balls=2
so probability of getting green balls=no.of possible outcomes /no of total outcomes=2/6=1/3
2) no of total outcomes of getting blue balls=5
no of possible outcomes of getting blue balls=1
so probability of getting blue balls=1/5


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