The number of values you multiply together is equal to the number of factors in a study. There are three factors, so multiply \_\_x\_\_x\_\_. The values that go into each slot represent the number of levels for each factor. In this case, 3x3x3=27. 
If a study has three factors, each with three levels, how many treatments are there? 
1) $$4$$ 
2) $$5$$ 
3) $$6$$ 
4) $$10$$ 
5) $$27$$ 