The average of the first 50 natural number is:

A 12.25

B 21.25

C 25

D 25.5

Correct Answer: Option D

Sum of first n non-zero positive integers n(n + 1)/2

So,

average of first n non-zero positive integers n(n + 1)/2n = (n + 1)/2 => (50 + 1)/2 = 25.5