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