After you place a bet, you will see that you have covered all the numbers on the roulette table, except for 3 - 0 and the two numbers from the 3rd. If the numbers start on the 12th, you win $150 or you bet - you are average. If the second 12th number comes out, the situation is the same - you will be average. However, if one of the 3rd No. 12 you bet comes out, you will win $180, so you will get a profit of $30.
