you are roughly a 3 to 2 with AK vs 78 (60%, 40%...if they are both unsuited)....the reason for this is even though AK is a dominant hand over 78 you still have nothing but high card. If a 7 or 8 hits the hand wins as long as a A or King doesnt hit... when you are all in and cant be bet out (if the flop is 7,J,Q, youd probably fold to a bet with 78, but all in u get to see all the cards) the chances of AK are only a little better than 7 8. There is roughly a 40% chance that you will hit a 7 or 8 and he will miss his king or ace.
If your AK is suited, and the 7 8 is not, you have to figure in the flush potential even if he hits and u miss, so your odds go up to roughly 65/35
hope this helps
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