What is the average of odd numbers from 1 to 40?

A 20

B 21

C 31

D 41

Solution

Correct Answer: Option A

sum of odd numbers from 1 to 40= 1 + 3 + 5 + ... + 39
= 20 (1 + 39)/2
= 20 × 40/2
= 400

Average = 400/20
             = 20

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