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A soil mass has coefficients of horizontal and vertical permeability as 9 x 10-7 cm/s and 4 x 10-7 cm/s, respectively. The transformed coefficient of permeability of an equivalent isotropic soil mass is

9 x 10-7 cm/s
4 x 10-7 cm/s
13 x 10-7 cm/s
6 x 10-7 cm/s

Correct Answer: 6 x 10-7 cm/s

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