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In: Computer Science

Given the number: 7992739874 What would the check-digit be after applying luhns algorithm and how would...

Given the number: 7992739874

What would the check-digit be after applying luhns algorithm and how would we find it?

Solutions

Expert Solution

--> Given number is 7992739874

--> Now take every second digit of the number and replace it with 2 times original number:

      ex: Take second digit 9

            2*9 = 18

            Since It have 2 digits add them up to get a single digit 1+8 = 9

--> So, the number becomes

      7    9    9    2    7    3 9    8    7    4

           18          4          6           16         8

            9         4          6            7          8

    7   9     9    4     7    6 9     7    7    8

--> Now take the sum of those digits

    7 + 9 + 9 + 4 + 7 + 6 + 9 + 7 + 7 + 8 = 73

--> So, the check-sum is 73, mod 10 will give 3

--> Since it is not 0, the number is not valid.

venereology answered 2 hours ago
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