# What is the Arithmetic Mean of First 20 Odd Natural Numbers?

**Answer: (3) 20**

**Explanation:-**** Formula –**** The sum of first n odd numbers = n ^{2}**

Then, the sum of 20 odd numbers = (20)

^{2}

= 20 x 20

= 400

Then, the average of first 20 odd numbers = 400/20

= 20

Hence, the answer is (3) 20.