20100
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The sum of the first 200 natural numbers is 20,001.
The sum of all the numbers 1 through 200 is 20,100.
The sum is infinite
200*50=10000
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).