What is probability of obtaining a value of 9 or greater?

[gastonj]

Consider the experiment of rolling a pair of dice. Suppose that we are interested in the sum of the face values showing on the dice.

What is the probability of obtaining a value of 9 or greater?

I know the answer is 5/18 but I don't know why or how???

 

[pka]

Here are all the possible outcomes from tossing a pair of dice.
There are thirty-six of them.
Count the pairs that give the required result.
Its probability is that number divided by 36.
(1,1), (1,2), (1,3), (1,4), (1,5), (1,6)
(2,1), (2,2), (2,3), (2,4), (2,5), (2,6)
(3,1), (3,2), (3,3), (3,4), (3,5), (3,6)
(4,1), (4,2), (4,3), (4,4), (4,5), (4,6)
(5,1), (5,2), (5,3), (5,4), (5,5), (5,6)
(6,1), (6,2), (6,3), (6,4), (6,5), (6,6)