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24 August, 23:09

An Arithmetic series has 20 terms. The first term is - 81. The sum of all the terms is - 480. Use the arithmetic sum formula to find the last term

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  1. 25 August, 02:57
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    The last term is 33.

    Step-by-step explanation:

    Sn = (n/2) (a1 + L) where a1 = first term and L = the last.

    So:

    -480 = (20/2) (-81 + L)

    -480 = 10 (L - 81)

    L - 81 = - 480 / 10 = - 48

    L = - 48 + 81

    L = 33.
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