Any set of three odd integers must be odd - for example, 3 + 5 + 7 = 15. Similarly, the sum of an even number of odd integers added together will always be an even integer.
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The sum of two odd numbers is always even.
The sum of two odd numbers is always even.
The sum of two whole numbers is odd when one but not both of them is odd.
The sum of the first 1,000 odd numbers is 1,000,000.
The sum of the first 50 odd numbers is 2,500.