Question

What is the sum of the odd natural numbers 1,3,5,7 and 9 ? (Use the formula ).

• A. 16
• B. 39
• C. 25
• D. 14

Answer 1

The correct option is C 25

1,3,5,7 and 9 are the first 5 odd natural numbers.

So, n = 5

In general, sum of the first n odd natural numbers =$n^2$

So, sum of the first 5 odd natural numbers =$5^2=25$