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Use the formula for the sum of the first n terms of geometric sequence.?

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find the sum of the first 12 terms of the geometric sequence:

3,6,12,24...

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  1. S(n) = {a(r^n - 1)}/(r - 1)

    a = 3; r = 2; n = 12

    S(12) = {3(2^12 - 1)}/(2 - 1) = 12 285

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