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The sum of the numbers 1 to 39 = 39 x 40 ÷ 2 = 780

The sum of the numbers 1 to 60 = 60 x 61 ÷ 2 = 1830

Therefore the sum of the numbers 40 to 60 = 1830 - 780 = 1050

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Q: What is the answer when you add all numbers from 40 to 60?
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