You bet one or more numbers by placing your bet on that or those numbers on the layout. If your number or one of your numbers should hit you win 35 to 1 on that number. The house edges: American double-zero wheel, 5.26 percent; the European single-zero wheel, 2.70 percent.

A true random number generator  a hardware random number generator (HRNG) or true random number generator (TRNG)  is cryptographically secure and takes into account physical attributes such as atmospheric or thermal conditions. Such tools may also take into account measurement biases.

The most popular picks are in fact 69, 77 and 7 (in descending order). It's well known amongst purveyors of conjuring tricks and the like that if you ask people to pick a number between 1 and 10, far more people choose 7 than any other number.