A Solution Containing Red Blood Cells at a Concentration of 2000

A solution containing red blood cells at a concentration of 2000 cells per mL undergoes three serial dilution steps, whereby 1 mL of starting solution is diluted with 9 mL of solvent at each step. What is the concentration of red blood cells after the final dilution step?

A) 666 cells mL^-1
B) 2.47 cells mL^-1
C) 2 cells mL^-1
D) 20 cells mL^-1
E) 74.1 cells mL^-1

Correct Answer:

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