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want to see my credit card number Iamp;#39;m only going to show it for a second so are you ready to screenshot all right here it is just kidding itamp;#39;s no oneamp;#39;s credit card number but how do I know this letamp;#39;s find out all credit card numbers have this property where when we are reading left to right we double alt digits and the odd placements and keep all of the digits in the even placements then we have all of the digits not numbers digits for example we donamp;#39;t have 12 we add one and two so for example we would do eight plus eight plus one plus two plus seven plus one plus six and so forth and if this is a valid credit card number this sum would be a multiple of ten so since we got a sum of 68 we know for sure this is not a valid credit card number so this is a quick way for a computer to check if you typed in your credit card number correctly because for example if you typed in a six instead of a five they will say that somethingamp;#39;s wrong
