Per the formula in the related link, substitution into the formula yields (3*12)1/2, which is (36)1/2 or 6.
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Geometric mean of 2 and 12 is 4.898979485566356. Look at link: "Calculation of the geometric mean of two numbers".
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Their geometric mean is the cube root of 8*4*12 = cuberoot(384) = 7.268 (to 3 dp)
Geometric mean of 9 and 16 is 12. Look at link: "Calculation of the geometric mean of two numbers".