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36
The odds of the ball landing on any single number are 37 to 1.
Roulette is a game of chance. There are 37 (38 in US roulette ) slots on the wheel - 18 red 18 black and 1 green ( 2 green in the US versions ). It is just as likely that the ball will land in any one of the 37 slots. The odds are 37-1.
17+17+17=51
17 is the absolute value of -17, that is, the value of the number without the negative number sign.