n*(n+1)=sum 100*(100+1)=10100
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The sum of the first 100 positive even numbers is 10,100.
The sum of the first 100 even numbers is 10,100
The sum of all the first 100 even numbers is 10,100.
The sum of the first 100 numbers, excluding zero, is 5,001.
The sum of the first 10 even numbers is 110.