What equation describes this trend?

Icebeam

New member
What equation describes this trend?
x=1 y=25%
x=2 y=40%
x=3 y=50%
x=4 y=57%
x=5 y=62%
x=6 y=66.60%
this is based upon how 1/4=25 2/5=40
each time the numerator and denominator both increase by one.
but I can't figure out the equation!
 
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