Ex: 3,45,1.142 Is an impossible combination (assuming you can even get 1.142 picks, only 3-5 maps support that many territories).
If you are referring the 3-picks, I'm pretty sure some of the impossible combinations have already been discussed in the "possible starting combinations" thread.
Otherwise your question is invalid.
impossible combinations of starting picks: 1/18/2013 15:34:38