Mark (√) against the correct answer in each of the following:
A die is rolled. If the outcome is an odd number, what is the probability that it is prime?
The probability that the outcome which is either, 1, 3 or 5 is prime is
= 
Favourable outcomes = 3 or 5
Total outcomes = 1, 3, and 5
Thus, probability=
⇒ 
1