The numerator of a fraction is randomly selected from the set {1,3,5,7,9}, and the denominator is randomly selected from the set {1,3,5,7,9}. What is the probability that the decimal representation of the resulting fraction is not a terminating decimal? Express your answer as a common fraction.

Question

zarkon · Answer

I see the same problems over and over ;)

dumbcow · Answer

there are 25 total possible fractions
fractions resulting in repeating decimals are:
9/7, 7/3, 7/9, 5/3, 5/9, 3/7, 3/9, 1/3, 1/7, 1/9

That is 10/25 or 2/5

zarkon · Answer

what about 5/7