Hard but easy
There are three boxes of socks. One is labelled red, the second is blue, and the last is red and blue. However, all the labels are wrongly placed. You may only take one sock from one drawer to identify each box's sock colour. Which box do you take a sock from?
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1 solution
Since everything is all mixed up, then the RnB label must have been misplaced on a unicolour (red only or blue only) socks drawer box. Once you've taken out one of them to know what the real label should be, then it's just a matter of redistributing all of the labels to where they belonged. It's going to be a cycle of 3 for 3 boxes, and the sock peeking is just a way to ascertain the direction of the rotation.