Ten Thousand (10,000)
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The number that comes after 9999 is 10000. In the decimal number system, after reaching the highest single digit (9), the next number is formed by adding 1 to the leftmost digit and resetting all other digits to 0. This process continues as we count upwards in a sequential manner.
It is 9999 (if a one is added, it becomes a five digit number: 9999 + 1 = 10,000)
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The next odd number after any odd number is found by adding 2. If you add only 1 you get an even number. So, 9999 + 2 = 10001
9999
9999