However, this isn't strictly true due to the presence of the green zero slot (and, additionally, the double zero in American roulette). In roulette, it might seem like the ball has a 50/50 chance of landing on either black or red every time. Each action is independent of the actions before it.
But this bias is based on fallacy or a mistaken belief. The gambler's fallacy is a bias in which we let past events influence our decisions and predictions about what will happen next.