Well you've deleted the portion of the code referring to x and y.

listPairs = [(a*b, y) | y <- [0..], a <- [0..], b <- [0..], (a*b) > 5, (a*b) < 500, (y*y) < 1001, mod y (a*b) == 0]

This will still never terminate however.

On Tue, May 14, 2013 at 10:17 AM, John <knowledge1202@gmail.com> wrote:

thanks to both!

listPairs = [(a*b, y) | a <- [0..], b <- [0..], (a*b) > 5, (a*b) < 500,

(y*y) < 1001, mod y x == 0]

Now I have it as you said, however the compiler complains about all y and x
and says they are NOT in scope.

Why is it so? I can't see any problem with that...

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