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28 July, 04:50

Consider the sequence below.

3, 1, 1/3, 1/9, ...

Select the explicit function which defines the sequence.

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Answers (1)
  1. 28 July, 06:27
    0
    As we can see it's a geometric progression.

    q = a2/a1

    q = 1/3

    so,

    an = a1. q^ (n - 1)

    an = 3. (1/3) ^ (n - 1)

    The one which matches is f (n) = 3. (1/3) ^ (n - 1)

    Alt C.
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