Journal #33

There are three clay containers. One of them has only pennies from the year 2005 in it, one has only pennies from the year 2007 in it, and the third has an equal number of each. They are labeled "2005", "2007" and "mixed", however, you know that the labels have been switched, so that each container is marked incorrectly. Can you properly label the containers without looking in them, and only pulling one coin out from one container?

pull one coin out, read the date, if it says 2005, put it back and reach into the others. if you find two 2005's guess which container is mixed and which one is 2005