Which of the following is not a natural number ?
0
Natural numbers are the counting numbers \(1, 2, 3, 4, \ldots\), starting from 1.
The numbers 1, 1000, and 25 are all counting numbers, so each is a natural number.
The number 0 is not included in the set of natural numbers; it belongs to the set of whole numbers instead.
So the number that is not a natural number is \(0\).
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