Question

If a single fair die is rolled find the probability of a 3 given that the number rolled is odd

Answer 1

A die has 6 sides, there is only one 3, therefore the probability of you getting a  is 
= 1 in 6

Answer 2

Given that the number rolled is odd, it can be 1, 3, or 5 = 3 possibilities.

Only one of the possibilities is success . . . rolling a 3 .

So the probability of success is 1/3 = 33 and 1/3 percent .