Q: In a bucket there are 3 blue balls and 2 red balls. What is the probability of drawing at least one blue ball when drawing two consecutive balls randomly?
Options:
(A) 9/10
(B) 16/20
(C) 2/5
(D) 3/5
(E) Let's give some random thoughts before answering.
P(at least one blue) = 1 - P(no blue, so 2 red) = 1- 2/5*1/4 = 9/10.
Therefore, the answer is (A).