Four people are going to play bridge, which begins with an entire 52-card deck being dealt at random, 13 cards per player. What is the probability that each player is dealt exactly one ace?

Still confused about ordered versus unordered sampling?

There are several ways to do this calculation. You should try it on your own, but then, go read Example 1.8.9 and the subsequent discussion on pages 37 - 39 of DeGroot & Schervish.