There are 4 digits in ISSN
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There are 210 4 digit combinations and 5040 different 4 digit codes.
Number of 7 digit combinations out of the 10 one-digit numbers = 120.
The first 8 digit number is 10,000,000, the last is 99,999,999 which means there are 90,000,000 8 digit numbers
How many two digit number are divisible by 5