Find the average of first 40 natural numbers.  Choose the most appropriate option
A) 20.5
B) 18
C) 19.5
D) 19
E) 20
Sum of first n natural numbers = n( n+1)/2   So, sum of first 40 natural numbers = 40*41/2= 
<gadget id="calculator">40*41/2</gadget>
<output>820</output>
820   Required average=820/40= 
<gadget id="calculator">820/40</gadget>
<output>41/2 = around 20.5</output>
20.5   20.5NSWER:20.5
<result>A</result>
Find the average of first 40 natural numbers.