A pair of dice is rolled What is the probability of getting

A pair of dice is rolled. What is the probability of getting a sum of 3?

Solution

if a pair of dice is rolled then total no possible out comes n(s)=6^2=36 A be the event of getting sum of two dice is 3 then A={(1,2),(2,1)} n(A)=2 probability of getting sum of the two dice is 3=P(A)=n(A)/n(S) =2/36=1/18