even, whole, non-negative numbers. (zero is not a natural number)
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Pi is not a natural number. Natural numbers are just the regular set of numbers used for counting (1, 2, 3, 4, ...). Pi, being not even a whole number, is not natural.
Yes.
The set of rational numbers includes the set of natural numbers but they are not the same. All natural numbers are rational, not all rational numbers are natural.
When it is not included in the natural numbers, it is referred to as 'the natural numbers with zero'.
All numbers are not natural numbers.Natural numbers are 1,2,3,4,5....