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15 February, 16:18

find the sum of the first 20 terms of an arithmetic sequence with a first term of - 14 and a comman difference of 4

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  1. 15 February, 19:18
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    480

    Step-by-step explanation:

    Sn = n:2 * (2a + (n-1) d)

    n = 20 a = - 14 d = 4

    S20 = 10 * (-28 + 19 * 4) = 480
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