Question

Question 11

Write the correct answer from the given four options.

The sum of successive odd numbers 1, 3, 5, 7, 9, 11, 13 and 15 is

a) 81
b) 64
c) 49
d) 36

Answer 1

We know that the sum of first n odd natural numbers is $n^2$
Given odd numbers are 1, 3, 5, 7, 9, 11, 13 and 15.
So, number of odd numbers, n = 8
$\therefore$ The sum of given odd numbers $=n^2=(8{)}^2=64$