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What is the period of a simple pendulum with a length of $3L$ and a mass of $2M$?

$2\pi \sqrt { \frac { L }{ g } } $

$2\pi \sqrt { \frac {3 L }{ g } } $

$2\pi \sqrt { \frac {6M L }{ g } } $

$2\pi \sqrt { \frac { 3L }{ 2Mg } } $

$2\pi \sqrt { \frac { 2M }{ g } } $