You meet a guy in a bar ...
So the guy proposes a wager.
He has a bag with 3 tiles in it. 1 tile has 2 red sides, 1 has 2 green sides, 1 has a green side and a red side.
You take a tile from the bag and place it on a table. It has a green side face up.
The guy says "I'll bet you even money that the other side of the tile is also green."
Should you take the bet? Reasons for your answer?