Am Not Responsible For any of the loss caused to you and the problem which may arise to you if you misuse this trick.
Ok now we ll come to the topic ,valid credit card number which can also be called as Primary Account Number(PAN) which has too many fields in it and each of them have a unique meaning.We can say a credit card number is valid,only when these set of characters which when passed through a algorithm or formula produces a valid result this will be clearly explained below.
A Credit card contains 16 numbers in it,now the set of first 6 digits in the credit card is called as \"Issuer identifier number"\ and the last digit is called as the check digit which is generated in a particular way so that it satisfy a certain condition or the Luhn algorithm or Mod 10 check. Luhn check will be explained later.
Now taking away the set of 6 identifier digits and a 1 check digit leaves us 9 digits in the middle which forms the account number.
OK Now there are 10 possible numbers ranging from 0 to 9 that can be arranged in these 9 places. Now this gives rise to a unique 109 combinations to be clear 1 billion account numbers are possible.
Now with each account number, eveytime an unique check digit is associated
But Amex issues a credit cards which has 15 digits. The account numbers in case of amex is 8 digit long.
Now the question is How to generate a Valid Credit Card Number???
If a credit card number is to be valid then it has to be validated by the MOD 10 algorithm/Luhn Check Which i have briefly explained. The algorithm was mainly designed to prevent accidental errors.
Now the question is How To Use The MOD 10 Algorithm/Luhn Algorithm???
The MOD 10 algorithm is one of the checksum formula . This formula is normally used to validate identification numbers besides the credit cards which was developed by a famous scientist Hans Peter Luhn who was from IBM.
Consider the following example:
Say we have 38520000023237 and we shall check if its a real credit card number/valid credit card number
 First remove the last digit for some moment, In our case 7 is the last digit .
 Consider the rest of the sequence that is 3852000002323
 Now Double every other digit starting from the right
3

8

5

2

0

0

0

0

0

2

3

2

3

6

8

10

2

0

0

0

0

0

2

6

2

6

 If the Doubly contains 2 digits then you need to just make it one by adding 10 = 1 + 0 = 1
 Now Add all the digits together and alos include last digit also 6+8+1+2+0+0+0+0+0+2+6+2+6+7 =40
 If the final total is divisible by 10, then the credit card number is valid , else it is not valid.
 40 mod 10 = 0 that means this number is valid.
Also Read:How to Format USB Drives to delete Viruses Permanently
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