Oh, isn't that lovely? There are four 9's in the number 9999. Just imagine those happy little 9's all lined up in a row, bringing joy to your day. Remember, there are no mistakes, just happy little accidents.
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9999
It is 9999 (if a one is added, it becomes a five digit number: 9999 + 1 = 10,000)
5
12546
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