1 and 2 are right. As for 3, nobody knows. There is a small potential difference that can be typed, but in written work there is ambiguity. For example:

vs.

If there is a space between the whole number and the fraction we can pretty much know that you add the 2 and the 1/3. The other implies multiplication. But generally there is no rule unless it's specified. I would be more than happy if grade school just dropped the notation.

-Dan