Find the average of first 40 natural numbers. · ABC26GN1499
Subject: General Aptitude · Chapter: Average
Find the average of first 40 natural numbers.
Answer
No answer key was printed for this question.
Explanation
Sum of first $n$ natural numbers $=\frac{n(n+1)}{2}$. So, sum of first 40 natural numbers $=\frac{40 \times 41}{2}=820$. $$\text { ∴ Required average }=\frac{820}{40}=20.5 .$$
Explanation as extracted from the printed page; notation may be imperfect.