[Haskell] About Random Integer without IO

[Jose manuel Hernando CobeƱa]

I need generate random numbers by create polygons with "wxHaskell",
I am searching in the web, but all I only find IO functions like
>>    test   :: Integer -> IO Integer
>>    test n =  do x <- randomRIO (1, n)
                      return x
I need this but with types :: Integer -> Integer

Thanks

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