Finding the sum of all odd (विषम) numbers starting from 1

Rule:- Square the amount of the numbers in the series.

To show this the sum of all numbers from 1 to 10 will be calculated. There are 5 odd numbers in this series.

1  2  3  4  5  6  7  8  9  10

In this you can see that the red numbers is odd numbers and green numbers is even numbers

To find the sum of all odd numbers square the amount of numbers in the series

That is 5*5 = 25

Let’s take an another example you have to find the sum of all odd numbers from 1 to 100.there are 50 odd numbers in the series

Therefore          50*50 = 2500 answer

This is the sum of all odd numbers from 1 to 100

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