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The number of digits in a valid credit card can change depending upon the type of card. MasterCard and VISA use a 16 digit system, while others including American Express use a 15 digit system.
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How many digits does a card number have?
Most credit and debit cards have sixteen digits. American Express cards have fifteen. Even fifteen digits is enough to allow every single person on Earth to have over a thousand credit cards, which is why it's unlikely that a random string of digits will turn out to be a valid credit card number.
Example of mastercard number?
There are 16 digits in a Mastercard number, usually starting with 5.Mostly, they are just an account number. Some of the digits, however, are "check digits." That is, they come from some mathematical formula being applied to some of the other digits. That makes it near impossible to simply make up a string of 16 digits that are a valid credit card number. Of course, the location of the check digits and the formula which generates them are carefully guarded secrets.So, sorry, no example.
You are a prime number you have two digits The sum of your digits are 8 what number are you?
There are actually three valid answers: 17, 53, and 71 All are prime and all have digits adding to 8.
How can one tell if a credit card number is valid?
In order to know whether or not the credit card number is valid, one should check out from the bank of the credit card, or using the card at an ATM machine.
What are the valid digits in a measurement called?
significant digits
