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8 March, 14:46

Consider the sequence below.

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

Select the explicit function which defines the sequence.

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  1. 8 March, 14:51
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    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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