One die is rolled. Find the probability of getting 6.

The probability of an event is given as:

Probability of an event = $\frac{\mathrm{Outcomes} \mathrm{of} \mathrm{an} \mathrm{event}}{\mathrm{Total} \mathrm{possible} \mathrm{outcomes}}$

There are six faces in the die and the numbers are (1,2,3,4,5,6). 
Therefore, the total possible outcomes are 6.
The number of favourable outcomes of getting a 6 is 1. 

Therefore, the probability of getting 6 is $\frac{1}{6}$.