An American Express card number consists of 15 digits, typically starting with the number 3.
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The correct format for an American Express (AMEX) card number is a 15-digit number starting with 3.
An American Express card number starts with the number 3 and is 15 digits long.
An American Express credit card number consists of 15 digits, starting with the number 3.
The correct format for an American Express card number, which consists of 15 digits, is XXXX XXXXXX XXXXX.
An American Express credit card number is typically 15 digits long and starts with the number 3.