Originally Posted by heehaww
Now you just need to know the chance of exactly 21, from which you can deduce P(over) and then the edge.
less than 21: 8292 (37.52%)
exactly 21: 1508 (6.82%)
more than 21: 12300 (55.66%)
i thought OP was just curious which was more likely. and he didn't say the odds for the bet, I guess 50-50? if so, the one who went with over would have 18.14% return on his stake, while the guy with under is losing at the same rate.