Xmas, Easter, Summer task creating real working credit card numbers using Luhn's algorithm | Teaching Resources
![worksheet function - Excel formula to test if 15 or 16 digit number is a valid credit card and return true / false (Luhn's algorithm) - Super User worksheet function - Excel formula to test if 15 or 16 digit number is a valid credit card and return true / false (Luhn's algorithm) - Super User](https://i.stack.imgur.com/8Szu8.png)
worksheet function - Excel formula to test if 15 or 16 digit number is a valid credit card and return true / false (Luhn's algorithm) - Super User
![worksheet function - Excel formula to test if 15 or 16 digit number is a valid credit card and return true / false (Luhn's algorithm) - Super User worksheet function - Excel formula to test if 15 or 16 digit number is a valid credit card and return true / false (Luhn's algorithm) - Super User](https://i.stack.imgur.com/n2btt.png)