There is a bet selection that will give you a 1331 .For ex if you take 3 spins .
RRR you have 1/8 chance but you have 3/8 chance of getting2 reds and one black.
There is a 1 in 16 that you will get 4 blacks in 4 spins.
RRR you have 1/8 chance but you have 3/8 chance of getting2 reds and one black.
There is a 1 in 16 that you will get 4 blacks in 4 spins.