Roulette is at most simple is about 50/50 ....either Red or Black or ODD Even.

 Really Pick 3 can be made into sort of a Roulette game of Red or Black. The Doubles could be made Green... and you lose.

 Doubles hit 27% of the time in Pick 3.... Singles hit 72% of the time. So.... about 1 outa 4 times you will lose if you play singles only. 

 But.... wait until a double hits ....then play your Singles ..the probability is better that your Single will hit. When it does ...it will be in one of 2 groups RED or Black.  That's as close to 50/50 as you will get in the Pick 3 game.

  Here are all 120 single numbers divided into 2 groups.... They are all the Singles that contain either or both of the digits  Zero or ONE......and the OTHERS...that do not contain a Zero or ONE.

                            Green (All doubles and Trips..you lose !) #90+10

 What are the odds a double won't show?

                      (1-0.27 ) ^ 2 = 0.5329 

Miss 3 in a row?   (1-0.27) ^3=  0.3890

miss 4 in a row?   (1-0.27) ^4  = 0.2840

What are the odds a double will show?

ONE time is ...          0.27

2 times is .......0.27 * 2= 0.0729

3times in a row....0.27^3=  0.019683