Imagine you had three boxes One contains two black marbles One contains two white marbles One contains both a black and a white marble Each box was labeled with their correct contents (BB, WW, BW). However a malevolent intern has swapped the labels so that they are all incorrect. You are allowed to take one marble out of a box and look at it, without looking inside. Using this method, what is the minimum number of draws you need to determine the contents of all three boxes?
