Haskell function won't work, what am i doing wrong?

Question

Hi i am trying to remove all multiples of m from a list (ex [2..100])

my Code:

crossOut :: Int -> [Int] -> [Int]
crossOut n ns = [ x | x <- ns , x /= (n*x)]

Answer 1

x /= (n*x) tests if x is n times itself, which isn't going to work. Try x `mod` n /= 0 instead.

Answer 2

Your function, when read in English, would sound like: "any x in ns, where x does not equal n times x, for some input n". Aside from n = 1, this will always be true, and so no elements will be removed.