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21 February, 23:46

Find the sum of the first 20 terms of the arithmetic sequence 4, 10, 16, 22 ...

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  1. 22 February, 00:30
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    n = 20

    d = 6

    a = 4

    L = a + (n - 1) * d

    L = 4 + (20 - 1) * 6

    L = 4 + 19*6

    L = 118

    Sum = (a + L) * n/2

    Sum = (4 + 118) * 20/2

    Sum = 122 * 10

    Sum = 1220
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