It is 9.
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9999 is the largest 4-digit number.When added with 1 it becomes 10000. 9999 + 1 = 10000.
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7
679 is the product of the largest single-digit prime number and the largest two-digit prime number.
10,000,000 is the smallest 8 digit number 99,999,999 is the largest 8 digit number