Raymond B. answered 07/27/21
Math, microeconomics or criminal justice
the roulette wheel is half black, half red, except for a green or two or three
Europe does one green or Zero, with half the rest black and the other half red
For a wheel with no green or zeros, odds of black are 50%
there's 36 numbers, half red, half black, with a 37th, 38th or 39th green color slot
for the 37 numbers, chances of black are 18/37
for the 38 number game, its 18/38
for the 39 number game it's 18/39
so depending on the wheel, odds of black are between about 46 and 50%
There is a mathematician who wrote a book on how to beat blackjack, slot machines and roulette. But even if you have a winning system, the House can cheat, or just blacklist you and arrest you if you come back, if you do win too much. It's not the best investment. Sports betting on the under tends to work, as fans bet too much on the over.