Help with exercise - Lists + Return functions

[artdias90]

Using Lists and recursivity , make a function that generates a list with a string containing all binary numbers of N bits.

this examples is non-recursive:

ex3 :: [String]
ex3 = [[x,y,z,w]|x <-"01",y<-"01",z<-"01",w<-"01"]

 

[joel76]

You mean, with N = 2, L= [0, 1, 2, 3] (00, 01, 10, 11) ?