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24 June, 14:41

Find the sum of all the even integers from 12 to 1980

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  1. 24 June, 16:30
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    1961124

    Step-by-step explanation:

    The sum of consecutive positive integers from n1 to n2 is equal to:

    n₁ + (n₁ + 1) + ... + n₂ = n₂ (n₂ + 1) / 2 - n₁ (n₁ - 1) / 2
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