find the average of first 40 natural numbers?
Choose the correct choice from the following choices:
A) 12.3
B) 15.4
C) 63.2
D) 45.2
E) 20.5
sum of first n natural numbers=n(n+1)/2;   So,sum of 40 natural numbers=(40*41)/2= 
<gadget id="calculator">(40*41)/2</gadget>
<output>820</output>
820.   Therefore the required average=(820/40) =20.5.   Ans: 20.5
<result>E</result>
find the average of first 40 natural numbers?