A pair of dice is rolled. What is the probability that the sum is 9 or that the first number is a 2?

E=


{(x,y)|(x+y)=9 or x=2}=


{(2,1), (2,2), (2,3), (2,4), (2,5), (2,6), (3,6), (4,5), (5,4), (6,3)} 

P(E)=


n(E)/36=


10/36