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18 February, 08:23

What is the sum of the first 30 terms of this arithmetic sequence? 6, 13, 20, 27, 34, ...

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  1. 18 February, 09:46
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    A=+7

    formula : An = A + (n-1) d

    A30=6 + (30 - 1) 7

    A30 = 6 + 210 - 7

    A30 = 209
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