find the average of first 40 natural numbers?	Choose the correct choice:	A) 40.5	B) 70	C) 80	D) 20.5	E) 10.5
sum of first n natural numbers=n(n+1)/2;   So,sum of 40 natural numbers=(40*41)/2 820.   Therefore the required average=(820/40) 20.5.   ANSWER 20.5 20.5
<result>D</result>
find the average of first 40 natural numbers?