Question

There are three bags. The first bag has two blue rocks. The second bag has two red rocks. The third bag has a blue and a red rock. All bags are labeled but all of the labels are wrong. You are allowed to open one bag, pick one rock at random, see its color and put it back into the bag, without seeing the color of the other rock. How many bags do you need to open to re-label all three bags correctly? Explain your logic.

Answer 1

two bags...............mmmm..