What will be the average of the odd numbers from 21 to 81?
Answer & explanation
Correct answer: option 2
The AP series of odd numbers is :
21 + 23 + 25...............+ 79 + 81
Average of the series = \(\frac{First\; term\; +\; Last \;Term }{2}\)
= \(\frac{21 + 81 }{2}\) = \(\frac{102 }{2}\) = 51