Question

Fine the average of first 100 natural numbers?
(1)50.5
(2)36.6
(3)50.8
(4)51

Answer 1

Step-by-step explanation:

1. sum of 1st n numbers is n(n+1)/2
2. " " " 100 '" " " " "100(101)/2=5050
3. average of 1st 100 numbers is 5050/100=50.5Similarly sum of next 100 numbers is 15050
4. average of these numbers is 15050/100=150.0
5. hence average of first 100 natural numbers is approximately 3 times of average of next 100 natural numbers