Note that's the calculation for a European (single green 0) wheel, not the American (green 0 and green 00) wheel, in which you'd replace with +18/38 (or 9/19) and -20/38 (or 10/19).
Yes, the American version is twice as bad for the player, but it doesn't matter; people are still plenty eager to play it...
Yes, the American version is twice as bad for the player, but it doesn't matter; people are still plenty eager to play it...