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The final number in this sum would be 18:

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 = 171

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10y ago
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Q: 1 plus 2 plus 3 plus ... equals 171?
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