40
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The correct answer is 6400.
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The sum of the first 30 consecutive odd numbers is 900.
The sum of the first 900 consecutive odd numbers is 810,000.
The sum of the first 350 consecutive odd numbers is 122,500.
The sum of the first 30 consecutive odd numbers is 900.
The sum of the first 1,300 consecutive odd numbers is 1,300 squared or 1,690,000.