A 12-sided die is rolled. The set of equally likely outcomes is (1,2,3,4,5,6,7,8,9, 10, 11, 12). Find the probability of rolling a 2.

Since the die has 12 equally likely outcomes, and only one of them is a 2, the probability of rolling a 2 is $1/12$. Answer: $\boxed{\dfrac{1}{12}}$.