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Geometric mean of 9 and 16 is 12. Look at link: "Calculation of the geometric mean of two numbers".
The geometric mean of 9 and 16 = square root of (9 x 16) = square root of 144 = 12.
Suppose 12 is the GM of 16 and x then 12 = sqrt(16*x) squaring both sides: 144 = 16*x so that x = 9
Geometric mean of 2 and 12 is 4.898979485566356. Look at link: "Calculation of the geometric mean of two numbers".
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