1. 2 million red blood cells
  2. 3 million red blood cells
  3. 4 million red blood cells
  4. 5 million red blood cells

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Answer: Option 3

The normal red blood count per cubic mm is 4 million red blood cells. An RBC count is measured in millions per cubic millimeter (million/mm3). Normal values may vary slightly among different laboratories. One example of normal values is: 4.1 to 5.1 million/mm3 for women.

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