Wouldn't that be 54.98 bits? 57 bits would be if you allowed mixed case with no constraint on how many are upper and how many are lower. With the constraint th

Wouldn't that be 54.98 bits? 57 bits would be if you allowed mixed case with no constraint on how many are upper and how many are lower. With the constraint that it has to be half upper/half lower you only get 252 times as many passwords instead of 1024 times as many.