There are 18 balls in a box: 10 balls are green, 6 are blue and 2 are white. Then 1 green and 1 blue balls are taken from the box and put away. What is the probability that a blue ball is selected at random from the box?
Options:
A) 5/16
B) 4/13
C) 3/13
D) 5/13
E) 6/13
If 1 green and 1 blue ball are taken from the box, then there are 9 green, 5 blue and 2 white balls, a total of 16 balls. If one ball is selected at random, the probability that it is blue is given by 5 / 16   5/16nswer : 5/16
<result>A</result>
There are 18 balls in a box: 10 balls are green, 6 are blue and 2 are white. Then 1 green and 1 blue balls are taken from the box and put away. What is the probability that a blue ball is selected at random from the box?