1 - Luhn formula Based on ANSI X4.13, the LUHN formula (also known as the modulus 10 -- or mod 10 -- algorithm ) is used to generate and/or validate and verify the accuracy of credit-card numbers. Most credit cards contain a check digit, which is the digit at the end of the credit card number. The first part of ...

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3 - How to prepare for the Microsoft Certified Desktop Support Technician (MCDST) Certification Introduction A research by the U.S. Department of Labor, shows that Computer support specialists held about 500,000 jobs in the year 2002, but at present there is still a shortage of skilled individuals to do this job. According to this research this is a fastest growing occupation through 2012...