There are three gold coins you could have pulled out. Two of them sit in the gold box and one sits in the mixed box, so two times in three the other coin is gold.
There are three boxes. One holds two gold coins, one holds two silver coins and one holds a gold coin and a silver coin. You pick a box at random and pull out a coin without looking. It’s gold. What’s the chance the other coin in that box is gold too?
Give me a hintThe hint
Count the gold coins, not the boxes.