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All numerator is a series of prime number And denominator is a series of all odd numbers So answer is 13/9

And series will be 3 5/3 7/5 11/7 13/9 17/11

You see in all the cases you have only prime numbers are used say your current number is a/b then next number is next prime after a/a

13 is the next prime number after 11 so missing number is 13/11

answer is 13/11