If we add 1 to the numerator and subt...

If we add 1 to the numerator and subtract 1 from the denominator, a fraction becomes 1. It also becomes 1/2 if we only add 1 to the denominator. What is the fraction?

`(2)/(9)`

`(3)/(5)`

`(4)/(7)`

`(5)/(13)`

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