Answer : We know that,

Probability of occurrence of an event

outcomes are 1, 2, 3, 4, 5, 6As 2, 3, 5 are prime numbers up to 6, so the desired outcomes are 2, 3, 5, and total

1/2
Conclusion: Probability of getting a prime number when a die is thrown is 1/2
Therefore, total no.of outcomes are 6, and total no.of desired outcomes are 3 Probability of getting a prime number