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Today, internet has become the essential component of life. As telephone, fridge it becomes the important feature. Now-a-days, people don't have much time and they wish to do shopping sitting at home. Credit card is purchase now and pays later. As credit card has the power to purchase the things, its frauds also increased. In this paper, the authors have included the operations performed to validate the credit card number. It will be done as a combination of Luhn algorithm and K-Means. Luhn algorithm will be applied if a credit card number is not accepted by k-means algorithm.