Range means subtracting leastnumber from high number si there are infinite whole numbers we will take them as "n" least number is 0 so subtract n-0=n that is the range if wholenumbers

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Range of a given set of numbers is the span of the numbers on the real number line. This is obtained by largest number - smallest number in the sequence of natural numbers. The first N natural numbers are  0 , 1 ,2 , 3 ... n-1, n

Range is n-0 = n.