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mean is the average, so 2 + 4 = 6; 6 / 2 = 3

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The above is the arithmetic mean which is NOT the same thing as the geometric mean.

The geometric mean of n non-negative numbers is the nth root of their product.

So GM(2, 4) = sqrt(8) = 2.828 (approx).

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Q: What is the geometric mean of 2 and 4?
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