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Gambling and luck\n\n 777 is used on most slot machines in the United States to identify a jackpot. As it is considered a lucky number, banknotes with a serial number containing 777 tend to be valued by collectors and numismatists.

No, there is no way to predict when a slot machine is going to hit a jackpot or to determine which machine is going to be lucky.

It's better to opt for a slot machine with a high pay-out rate (95% is ideal). The higher the rate the more you will be paid out and the greater the chance that one of those pay-outs will be the jackpot. You should know the combinations that pay out on a slot machine; in fact you should try to memorize them.