Posted by Larry on .
A package of selfsticking notepads contains 6 yellow, 6 blue, 6 green, and 6 pink notepads. An experiment consists of randomly selecting one of the notepads and recording its color. Find the probability that a green notepad is selected given that it is either blue or green.
A) 1/2
B) 1/3
C) 1/12
D) 1/4
I think the answer is A. I added 6+6+6+6= 24
then 6 blue + 6 green= 12
then 12/24= 1/2
Is this right?

Statistics 
PsyDAG,
From your description, I'm not sure what is being asked.
If it is "either blue or green," you are right. If it is just green ("green notepad is selected"), then 1/4 is correct.