Question 134446
Given that all three bins are mislabeled.

1)Pull a marble from the bin labeled mixed. Since the bin is mislabeled, this cannot be the mixed bin. Whatever color you draw must come from a bin with only that color in it. Set the mixed label on the ground

2) Whichever color you drew in step one (white or black), take the matching label from the bin that has that label on it and put it on the bin from step 1.

3) The bin that still has a label that you haven't touched is still mislabeled. 

4) Move the label from step 3 bin to the other bin that doesn't yet have a label.

5) Move the mixed label to the only bin left without a label.