Dozen bet A bet that the number will be in the chosen dozen: first (1 12, Premire douzaine or P12), second (13 24, Moyenne douzaine or M12), or third (25 36, Dernire douzaine or D12). Column bet A bet that the number will be in the chosen vertical column of 12 numbers, such as 1 4 7 10 on down to 34.