Either go ahead and add them, or use the formula for an arithmetic series.
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The sum of all the odd numbers between 1 and 12000 is 36000000.
501
You can't find five odd numbers that add up to fifty; the sum of five odd numbers will always be odd.
The sum of the first 500 odd numbers is 250,000.
The sum of all the odd numbers from 1 through 100 is 10,000