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29 June, 02:21

Find the sum of the first 25 terms of the arithmetic sequence - 2, 2, 6, 10, 14 ...

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  1. 29 June, 02:29
    0
    1150

    Step-by-step explanation:

    a2=a1+d

    d=4

    sn = (n/2) (2a1 + (n-1) d)

    s25 = (25/2) (2 * (-2) + 24*4) = 25*46=

    1150
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