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27 April, 07:58

The third term in a geometric sequence is - 81. The common ratio is 1/3

What is the second term of the sequence?

If you answer, can you explain it?

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Answers (1)
  1. 27 April, 08:29
    0
    Step-by-step explanation:

    The formula for the nth term of a geometric sequence is expressed as follows

    Tn = ar^ (n - 1)

    Where

    Tn represents the value of the nth term of the sequence

    a represents the first term of the sequence.

    n represents the number of terms.

    From the information given,

    r = 1/3

    T3 = - 81

    n = 3

    Therefore,

    - 81 = a * 1/3^ (3 - 1)

    -81 = a * (1/3) ^2

    -81 = a/9

    a = - 81 * 9 = - 729

    The exponential equation for this sequence is written as

    Tn = - 729 * (1/3) ^ (n-1)

    Therefore, to find the second term, T2, n = 2. It becomes

    T2 = - 729 * (1/3) ^ (2-1)

    T2 = - 729 * (1/3) ^1

    T2 = - 729 * (1/3)

    T2 = - 243
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