## What is the formula for sum of odd numbers?

What is the sum of odd numbers from 0 to 50.

If the number is starting from 1 then you can do simply n^2.

for example: if n=6 like 1,3,5,7,9,11 then it’s sum will be 6^2=36.

But if odd number series not start from 1 then formula will be sn=n/2(2a+(n-1)d)..

## How many ways can 20 be written as the sum of 3 different numbers?

of ways in which 20 can be writtenas sum of 3 non negative interger is 231.

## How many ways are there to add four positive even numbers to get a sum of 24?

588 waysTherefore, 24 can be written as the sum of four positive integers such that exactly two of the integers are the same in 12 × 49 = 588 ways.

## What is the sum of the first four odd numbers?

Sum of first four odd numbers = 1 + 3 + 5 + 7 = 16.

## What 3 odd numbers can add up to 30?

Therefore the sum of three odd numbers is always an odd number. Hence Proved. Let the number is 15,13 and 3 then 15=2*7+1 13=2*6+1 3=2*1+1 where 1,6 and 7 now 15+13+3=2*7+1+2*6+1+281+11 =2(7+6+1)+3 =2*14+3(24 is our ‘m’) and 2*14≠30.