Colored card probabilities A box contains 3 cards. One card is red on both sides, one card is green on both sides, and one card is red on one side and green on the other. One card is selected from the box at random , and the color on one side is observed. If this side is green, what is the probability that the other side is also green?
My attempt:
3 cards
R R 
G G 
R G 
3/6=1/2 chance of getting green
P(GG|G)=$\frac{1/2)(1/2)}{1/2}$
$=1/2$
Does this look ok?
Same question I jsut found: Conditional probability question with cards where the other side color is to be guessed 
Now I am torn between 1/2 and 2/3

Everything fine.
$$Pr (GG \mid G)=\frac{Pr GG}{Pr G}=Pr G=1/2.$$
