Question

Why is 0 not included in yhe set of natural numbers?

Answer 1

Natural numbers  are called natural or counting numbers, because they can be represented by objects. Zero is a member of whole numbers.

Answer 2

Natural numbers can be represented by objects , such as 2 oranges for 2  , but 0 cannot be . Furthermore , $\frac{a}{n}$ , where a is a whole number and n is a natural number , makes sense , but if n = 0,  then it is senseless .