Question

Two number cubes are rolled. What is the probability that the sum of the numbers rolled is either 3 or 9?

Answer 1

$|\Omega|=6^2=36\\ |A|=\underbrace{2}_{\text{the sum is 3}}+\underbrace{4}_{\text{the sum is 9}}=6\\\\ P(A)=\dfrac{6}{36}=\dfrac{1}{6}\approx17\%$