Your question is not in proper way.but i can give the way of solve the problem.
Since the die is fair,there are only six possible outcomes.
there is only one number 5 on a die.the probability of the event of obtaining a 5,which can be indicated by P(5), therefore
the obtatining of a 5 is, P(5)=1/6
this question is not regarding what would you ask but i give you answer in my sense.
you ask if pair of dies throw it mean two dies one die has 6 side then than two have 12 side.
two dies have 2 side of 5 and one pair of each like 5. ( only one favorable chance to come in each pair )
we can find probability by favorable chance divided by total chance
probability = favorable chance / total chance
probability = 1 / 6
0r
0.167