For part c it seems like the ZT doesn't exist. Anybody get the same thing or am I doing it wrong? -Pjcannon 23:11, 23 February 2009 (UTC)
I thinkthe answer is exactly same as part b answer except that the ROC is $ z < \frac{1}{3} , z > 1 $--Kim415 00:33, 24 February 2009 (UTC)
