One of the most important tips you could consider when playing roulette as a casino newbie is sticking to the table minimum and focusing on only playing the outside bets. Bet on either black or red for every new spin and you will enjoy a 1:1 payout while covering 18/38 potential combos.

A double bet is the most easy-to-understand multiple bet on offer. It's just two different bet selections combined into one bet. If your betting double succeeds, you win and receive a good payout  better than you could expect from placing two separate single bets. A single bet is a bet made on one market event.

The strategy had the gambler double the bet after every loss, so that the first win would recover all previous losses plus win a profit equal to the original stake. Thus the strategy is an instantiation of the St. Petersburg paradox.