The geometric mean of the observations x₁, x₂, x₃, …, xₙ is G₁. The geometric mean of the observations y₁, y₂, y₃, …, yₙ is G₂. The geometric mean of observations (x₁/y₁, x₂/y₂, x₃/y₃, …, xₙ/yₙ) is

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