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Insert five numbers between 1/27 and 27 to form a geometric sequence. there are 2 answers

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  1. 1 April, 12:26
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    1/27, 1/9, 1/3, 1, 3, 9, 27

    27, 9, 3, 1, 1/3, 1/9, 1/27

    Step-by-step explanation:

    The nth term of a geometric sequence is:

    aₙ = a₁ rⁿ⁻¹

    If 1/27 is the first term, and 27 is the 7th term, then:

    27 = 1/27 r⁷⁻¹

    27 = 1/27 r⁶

    27² = r⁶

    27 = r³

    r = 3

    This sequence is 1/27, 1/9, 1/3, 1, 3, 9, 27.

    On the other hand, if 27 is the first term, and 1/27 is the 7th term, then:

    1/27 = 27 r⁷⁻¹

    1/27 = 27 r⁶

    1/27² = r⁶

    1/27 = r³

    r = 1/3

    This sequence is 27, 9, 3, 1, 1/3, 1/9, 1/27.
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