Find the average of first N natural numbers
Write a program to find the Average of first N natural number.
Input : 10 Output : 5.5 1+2+3+4+5+6+7+8+9+10 = 5.5 Input : 7 Output : 4.0 1+2+3+4+5+6+7 = 4
Prerequisite : Sum of first n natural numbers.
As discussed in previous post, sum of n natural number n(n+1)/2, we find the Average of n natural number so divide by n is n(n+1)/2*n = (n+1)/2. Here 1 if first term and n is last term.
Time Complexity : O(1)
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