how are first four odds calculated?
For box First four bets, you multiply the number of selections for 1st place, 2nd place (minus 1), 3rd place (minus 2) and fourth place (minus 3). If you box six horses in a First four bet, it will cost 6 x (6-1) x (6-2) x (6-3) = $360 for a full $1 unit.