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13 May, 12:35

Write the arithmetic sequence that has four arithmetic means between - 20 and 20.

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  1. 13 May, 13:03
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    Let the terms be

    a, a+d, a+2d, a+3d, a+4d a + 5d

    so a = - 20

    and a + 5d = 20

    -20 + 5d = 20

    5d = 40 so

    d = 8

    -20,-12,-4,4,12,20 is the required sequence.
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