The American roulette wheel
The American roulette wheel is divided into 38 equal slots, 0, 00 and the numbers from 1 to 36 including 1 and 36. The sequence of the numbers is not random. The number are put this way in order to achieve some balance between high (18-36) and low (1-18), black and red, odd and even numbers:
- the red and black numbers alternate;
- usually two odd numbers are followed by two even numbers;
- all red numbers are opposite the black ones. For example, 25 is red, 26 is black;
- each odd number is placed opposite its subsequent number. For example, 25 is opposite 26;
- most of the numbers are part of a pair with one number between them. The sum of a pair is either 37 or 39.
Zero and double zero are green and are placed opposite each other. The rest of the numbers are either red or black.