In a bag there are a certain number of orange balls and blue balls. The probability of picking up exactly 1 blue ball when 2 balls are randomly drawn, is 1/2. Which of the following is the ratio of the number of orange balls to blue balls in the bag Choose the correct choice:
A) 2:1 B) 1:1 C) 1:31 D) 1:3 E) 1:5
since the probability of drawing a blue ball out of two picks is 1/2.   the ratio of the blue ball to orange balls should be 1:1   Answer : 1:1
<result>B</result>
In a bag there are a certain number of orange balls and blue balls. The probability of picking up exactly 1 blue ball when 2 balls are randomly drawn, is 1/2. Which of the following is the ratio of the number of orange balls to blue balls in the bag