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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
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