11/32
the top numbers are adding 2 every time (or you could say they're the odd numbers starting with 3) and the bottom number is doubling each time (or you could say multiplying by 2)
the answer could also be represented by the sequence
a subn = (2n+1)/2^n
therefore a1 would be 3/2, a2 would be 5/4, a3 would be 7/8, a4 would be 9/16 and a5 would be 11/32.....
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