Question

The sum of the first n odd numbers is n^2. What is the sum of the odd numbers from 1 through 31?

Options:
225
961
900
256

Answer 1

256

Explanation:

sum of the first n odd number is n^2

if we want to find the sum of of 1 thru 31

to find out how many numbers that is

(1+31)/2 = 32/2 =16

there are 16 numbers

n^2 =16^2 =256