Each bag below has lots of counters in it, coloured either blue or yellow.
In this game you choose a bag, and remove one counter at random. If you get a blue counter you win £20 (this is pretend – no-one is going to send you £20!), if you get a yellow counter you don’t win.
But there are some additional rules:
If you choose Bag A you get a guaranteed chocolate bar regardless of what counter you draw.
If you choose Bag B you don’t get a chocolate bar, but you do get a 50% higher chance of getting a blue counter.
Decide which bag you would like to choose!
CLICK on the bag to ‘choose’ it. Did you win? (Then scroll down to see more).
Thinking about the game:
To make an informed decision in this game we need to know our absolute chances of winning in Bag A and B, not just the chance of Bag B relative to Bag A.