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chances are you have a credit card in your wallet on the front is usually something like your name and other information like your bank and the card carrier like Visa MasterCard etc and a string of sixteen fifteen or fourteen numerical digits these digits vary from card to card and theyamp;#39;re enough for merchants to transact business with your bank on your behalf however this string of numbers isnamp;#39;t random in fact thereamp;#39;s a secret code in there that validates your card and keeps it safe all in the number structure itamp;#39;s a low-tech mathematical algorithm called the loon formula invented by Hans Peter Luhn in 1954 this mathematical tool actually dates back to before the existence of credit cards even with that fact itamp;#39;s included in every credit debit an ATM card on earth and it also makes for a mind-blowing bar trick if people donamp;#39;t know it hereamp;#39;s how you can see how it works first youamp;#39;ll want to write out your or any credit car
