From Wikipedia: It was announced that the March 9, 2010 episode would be the season finale, leaving three episodes unaired.
However, on November 4, 2009, it was announced that the Numb3rs episode order had been cut from 22 to 16 episodes.
So, at least it won't be going alone. Couldn't find anything on the state of Medium, though.
Quis custodiet ipsos custodes?