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7 August, 18:55

How to find the sum of 2+4+6 ... + 40?

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  1. 7 August, 21:45
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    Answer 420.

    a, is the first term. d is difference.

    Since this is an arithmetic progression, I use this formula.

    Un = nth term

    Sn = sum of terms.

    First find the number of terms, which is 20.

    Then use the second formula to find the sum.
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