Is zero not an element of the set of natural numbers?

Is zero not an element of the set of natural numbers?
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Let N be the set of natural numbers. Describe the following relation in words giving its domain -Maths 9th

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On a set N of all natural numbers is defined the relation R by a R b iff the GCD of a and b is 2, then R is -Maths 9th

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Description : The relation ‘is less than’ on a set of natural numbers is -Maths 9th

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