Find the average of first 40 natural numbers.
Choose the correct choice from the following answers
A) 15.5
B) 20.5
C) 40.5
D) 25
E) 30.5
Explanation:   Sum of first n natural numbers = n(n+1)/2   Hence, sum of first 40 natural numbers = (40 x 41)/2 = 820   Therefore, required average of = 820/40= 
<gadget id="calculator">820/40</gadget>
<output>41/2 = around 20.5</output>
20.5   ANSWER: 20.5
<result>B</result>
Find the average of first 40 natural numbers.