It is not. 1000 is, so the question is nonsensical.
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The smallest 5 digit odd number is: 10001 The greatest 4 digit even number is: 9998 Subtracting 9998 from 10001 gives you 3.
It is 9998, or if the digits can't be repeated, it is 9876.
It is: 9998
9998
Th e greatest 4-digit even number is 9,998 .