Can I use these interchangeably?
It's a question without answer. / It's a question with no answer.
It's a question which has no answer. / It's a question which hasn't answer. / It's a question which doesn't have answer.

Question

Can I use these interchangeably?
It's a question without answer.  /  It's a question with no answer.
It's a question which has no answer. /  It's a question which hasn't answer.  /  It's a question which doesn't have answer.

Answer

It's a question without answer. / It's a question with no answer.
It's a question which has no answer. / It's a question which hasn't answer. / It's a question which doesn't have answer.

It's a question without AN answer /  It's a question with no answer.  
It's a question which has no answer /  THIS ONE IS INCORRECT / It's a question which doesn't have AN answer.

These all mean the same thing.  :)

Answer

They are correct in grammar, but "It's a question with no answer" seems more natural.