Answer 1

Total outcomes of throwing a dice once are 1, 2, 3, 4, 5 and 6
(1) Probability of getting a prime number
Prime numbers are 2, 3 and 5 in throwing a die once
Probability of getting a prime number = `3/6 = 1/2`

(2) Probability of getting an odd number
odd numbers are those that are not divisible by 2.
So, there three odd numbers in throwing a dice once which is 1, 3 and 5.
Probability of getting an odd number = `3/6 = 1/2`