Question

Find the probability of rolling a prime number when a die is rolled.

Answer 1

Prime numbers on a die are 2, 3 and 5.
Probability is 3/6=1/2, so the answer is B.

Answer 2

$|\Omega|=6\\ |A|=3\\\\ P(A)=\dfrac{3}{6}=\dfrac{1}{2}=50\%$