In this task, you need to provide the correct option for a given problem on probability from the provided options.

Let me give you an example: Problem: in a throw of a coin find the probability of getting a tail ? 
Options: a ) 1 / 2 , b ) 1 / 3 , c ) 1 / 4 , d ) 2 / 5 , e ) 2 / 7
The answer to this example can be: a
Here is why: "s = { h , t } e = { t } p ( e ) = 1 / 2 answer is a"

OK. solve this:
Problem: if you keep rolling a pair of dice together till a sum of 5 or 7 is obtained , then what is the probability that a sum of 5 comes before a sum of 7 ? 
Options: a ) 5 / 5 , b ) 4 / 5 , c ) 3 / 5 , d ) 2 / 5 , e ) 1 / 5
Answer:
d