simplify

We can bring the y^-2 down to the denominator and divide by the x to get 3x^2/y^5

:D

Using algebra, we can see after subtracting a few numbers, we notice there are 10 numbers, therefore there are 5 pairs and one number.

$1-2, 4-8, 16-32, 64-128, 256-512, 1024$

using normal subtraction 

We get 

683

1. Oh my god I answered on the wrong question