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Population $y$ grows according to the equation $\dfrac { dy }{ dt } =ky$, where $k$ is a constant and $t$ is measured in years.

If the population doubles every $6\text{ years}$, then the value of $k$ is

A

$\ln { 2 }$

B

$\dfrac { \ln { 2 } }{ 2 }$

C

$\ln { \dfrac { 1 }{ 2 } }$

D

$\dfrac { \ln { 2 } }{ 6 }$

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