A bag contain 5 blue and 4 black balls. Three balls are drawn at random. What is the probability that 2 are blue and 1 is black.
n(S)=9C3 n(E)=(5C2*4C1)
p(E)=n(E)/n(S) =(5C2*4C1)/9C3........simplify
P(E)=10/21
Ans is 10/21 probability
probability=10/21
p(E)= 5c2 *4c1 / 9c3 = 10/21
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