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94) Which of the following ratio is correct regarding the percentage void ratio?

  1. a) The ratio of the volume of air voids to the total volume of the soil sample
  2. b) The ratio of the volume of air voids to volume of total voids in a soil sample
  3. c) The ratio of the volume of air voids to volume of water in a soil sample
  4. d) The ratio of the volume of voids to the total volume of the soil solid
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