there are 36
numbers on the wheel and then there is a 0 as well. the odds pay 35-1 which is the odds on 36 nos(i.e 35-1 plus your stake back).
I if you put 1 chip on every number(except 0) it would give you back the same amount of chips that u used.
0 is considered as the 'house edge' which means that its their % for running the game( Litterally 0 is just a number the same as any other on the wheel and it still pays the same).
I think the % is 3.1? on roulette(single 0)
00 is bad the house edge is doubled as there are 2zeros.
Its a banned game in uk land based
casinos(or was under the gaming board regs)
00 is a bad gamble and its foolish to play especially if you have the option of single 0