The sum of the first 10,000 even numbers is 100,010,000.
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The sum of the first 50 even numbers is 2,550.
Their sum is 10000.
There are 12 even numbers between 2 and 24 inclusive.The sum is 154.
The answer to what is the sum of the first positive even numbers is 930. It doesn't mean that you add all the even numbers up until you reach the number 30. In fact, since you have to get the sum of the even numbers, you have to add all even numbers until you get to the number 60.
First 125 numbers sum to 125/2 x 126, so first 125 even numbers sum to double that ie 125 x 126 = 15750