Given a bag with 2 red balls and 3 yellow balls, you randomly select one of them, in order. If the second ball you take is yellow, what is the probability that the first one was also yellow?	Answers:
A) 1/2
B) 1/5
C) 3/4
D) 1/3
E) 3/5
This is a conditional probability question. Basically we are told that out of 2 balls picked one is yellow and are asked to find the probability of the other one also to be yellow.   So, possible options for this other ball would be: W, W, B, B (as one yellow is already picked)   So the probability for that ball to be yellow too is 2/4=1/2.   Option 1/2
<result>A</result>
Given a bag with 2 red balls and 3 yellow balls, you randomly select one of them, in order. If the second ball you take is yellow, what is the probability that the first one was also yellow?