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9 January, 11:51

Let the geometric sequence {an} be defined as follows: {12, 6, 3, 3 / 2, 3 / 4, 3 / 8, ... } Find the sum of the entire sequence, S∞. A) 24 B) 240 C) 1,080 Eliminate D) 2,176,782,336

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  1. 9 January, 12:30
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    A) 24

    Step-by-step explanation:

    The given geometric series is {12, 6, 3, 3 / 2, 3 / 4, 3 / 8, ... }

    Each term can be represented as a product of its previous term and / [/frac{1}{2}/]

    The generic term of the series can be represented as the product of the first term 12 and / [/frac{1}{2}^{n-1}/] where n is the index of the term in the series.

    The sum to infinity of such a series is given by the following formula:

    /[/frac{term1}{1-ratio}/]

    Substituting and calculating:

    /[/frac{12}{1-/frac{1}{2}}/]

    =/[/frac{12}{/frac{1}{2}}/]

    =12*2 = 24
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