[Haskell-beginners] Type assignment for List

[RAJATKUMAR ZALA]

Hello Friends,

I am totally new to Haskell. I am learning Haskell from a website on my own pace. From that site, I came to know about list in haskell and its type assignment. There is a confusable question on site. I am posting question here....



1. Given that the expression []:xs is well typed, which of the following is not a possible type assignment for xs?


Options:-

1. xs :: [Int]
2. xs :: [[Float]]
3. xs :: [[[Char]]]
4. xs :: [[[[Bool]]]] 


If any friend know about it then please clarify me on it.

Thanks in advance

Rajatkumar Zala
India