Find the missing number in the sequence ?
3 5/3 7/5 11/7 ? 17/11

13/9
3 5/3 7/5 11/7 13/9 17/11

Numerator is prime number series 3,5,7,11 13 17
and Denominator is +2 series 1(1=1/1),3,5,7,9,11

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