(n)( n+1)/2 where n = 50. (50 x 51)/2 = 2,525
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The first 100 odd natural numbers are the number 1-201, ignoring all even numbers. If you think about this for a moment, you realize that : 1+201 = 202 3+199 = 202 5+197 = 202 etc. With this, you can pair up all of your numbers leaving you with 50 pairs, all equaling 202. Ergo: 50*202 = 10100 is your sum.
50
The sum of the first 50 even numbers is 2,550.
The sum of the first 50 odd numbers is 2,500.
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