Plating 0.1 mL of a sample diluted by a factor of 10^(-3) produced 43 colonies. What was the original concentration (OCD) in the undiluted sample? 4.3x10^-5 CFU/mL 4.3x10^-4 CFU/mL 4.3x10^5 CFU/mL 4.3x10^4 CFU/mL
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