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25 June, 04:08

Find the sum of the first 20 terms of the sequence 4,6,8,10 ...

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  1. 25 June, 04:18
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    4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42

    a (n) = a₁ + d (n - 1)

    a (n) = 4 + 2 (n - 1)

    a (n) = 4 + 2 (n) - 2 (1)

    a (n) = 4 + 2n - 2

    a (n) = 2n + 4 - 2

    a (n) = 2n + 2
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