How useful do you find combinations ?

[knockonwood]

hero has 8h8s, the board is 7h9s10s.

You call in on the button and both blinds fold. Villain bets into you on the flop.

Most likely hands from villain are AA,KK,QQ,JJ,AK and 50% of the time AQ.

So, the odds are the odds that he has you beat (with an overpair) are 24:24, or 1:1. (there are 24 combinations of high pairs and 16+8=24 combinations of the Ace high hands)

We are 1:1,`so we should stay in the hand (for the time being)

How many of you compute these sort of combinations when in a hand?