How to calculate pair losing vs overcards etc?

[Saborion]

How do I calculate the chances of my pocket Q's holding up against either AA, KK or AK? And so on.

Seen some earlier post a while ago when people used something like C[x,x]. Anyone care to make a short explanation of that one? Seems like something one should know. [img]/images/graemlins/smile.gif[/img]