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Today, 07:17

What is the sum of these first 36 terms 1+4+7 + ... + 103+106

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  1. Today, 07:50
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    So,

    first term (a) = 1

    last term (l) = 106

    no of terms (n) = 36

    Sn=n/2 (a+l)

    =18 (107)

    =1926
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