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I'll assume you mean the first 30 positive integers, and not real numbers. That would be 31 X 15, or 465. 30 + 1 = 31, 29 + 2 = 31, 28 + 3 = 31, etc. This can happen 15 times, with 15 + 16 = 31 being the fifteenth.

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16y ago

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Q: What is the sum of the first 30 positive numbers?
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