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What is the sum of the following geometric series?

$$3-\frac { 3 }{ 2 } +\frac { 3 }{ 4 } -\frac { 3 }{ 8 } +\frac { 3 }{ 16 } -...$$

$2$

$\dfrac { 2 }{ 3 } $

$6$

$-2$