There are three boxes. The first one is labelled “APPLES”. The second one is labelled “ORANGES”. The third one is labelled “APPLES & ORANGES”.
You know that each is labelled incorrectly. You can pick one fruit from one box which you choose.
Which box do you draw the fruit from so that you can you label the boxes correctly?
Pick from the one labelled “Apples & Oranges”. This box must contain either only apples or only oranges.
E.g. if you find an Orange, label the box Orange, then change the Oranges box to Apples, and the Apples box to “Apples & Oranges.”