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19 July, 18:49

163, 160,157, ... Find the 42nd term.

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  1. 19 July, 21:48
    0
    40

    Step-by-step explanation:

    163, 160,157, ... Find the 42nd term

    a_1 = 163

    common difference d = 160 - 163 = - 3

    use the formula : a_n = (n - 1) * d + a_1

    so

    a_42 = (42 - 1) * (-3) + 163

    a_42 = 41 * (-3) + 163

    a_42 = - 123 + 163 = 40
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