The sum of the first 15 odd numbers is 225.
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The sum of the first 300 odd numbers is 90,000
The sum of the first 40 odd numbers is 1,600.
the sum of first 50 consecutive odd numbers is 9801
The sum of the first 500 odd counting numbers is 250,000.
The sum of the first 60 consecutive odd numbers is 3,600.