The sum of all the numbers 1 through 200 is 20,100.
200*50=10000
You use the formulae (n^2 + n)/2 So as n = 200 that would be 20,100
20100
The sum of all odd numbers 1 through 99 is 9,801.
The sum of the first 200 natural numbers is 20,001.
The sum of all the numbers from 101 through 200 is 15,050.
The sum of all even numbers from 2 through 200 is 40,200.
201
The sum of the first 200 even numbers is 40,200.
200*50=10000
7500
20100
You use the formulae (n^2 + n)/2 So as n = 200 that would be 20,100
The sum of all odd numbers 1 through 99 is 9,801.
The sum of the first 200 natural numbers is 20,001.
This is the way I would do it: The sum of the 1st & 100th numbers = the sum of the 2nd & 99th numbers = the sum of the 3rd & 98th numbers all the way to the sum of the 50th & 51st numbers; each of the sums equals 200. So I would multiply 200 by 50 (10000).
200*201/2=20100