I really have no idea what you're talking about because you mention "overs" and "pairs" without any context.
Monotone flop with no known cards:
4 * C(13,3)/C(52,3) = 5.18%
Decent intro to probability text
What I'm gleaning from your post is that you're having trouble differentiating between combinations and permutations. You should be able to find something in < 10 seconds on google.