Integers
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"Natural Numbers" can mean either "Counting Numbers" {1, 2, 3, ...}, or "Whole Numbers" {0, 1, 2, 3, ...}, depending on the subject.
Counting numbers are positive integers 1, 2, 3 and so on. There is some disagreement whether natural numbers are the same thing or whether they include zero like whole numbers.
Whole Numbers are simply the numbers 0, 1, 2, 3, 4, 5, …(and so on)Counting Numbers are Whole Numbers, but without the zero. Because you can't "count" zero.
natural number means whose straiting from 1, 2, ................................. and counting numbers starting from 0,1, 2, ..........................................
Whole numbers are known as zero plus the "counting numbers." (1, 2, 3, ...) So, the whole numbers of 21 would be 0 - 21. (23 numbers.)