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1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20 = (20 x (20 + 1))/2 = 210

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13y ago
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Q: What is the sum of the numbers from 1 to 20?
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