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1. Three tubes, numbered 1 to 3 , each contains 100uL of 2NHCl.100ul of distilled water Was added to each of these three tubes. 50uL

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1. Three tubes, numbered 1 to 3 , each contains 100uL of 2NHCl.100ul of distilled water Was added to each of these three tubes. 50uL of serum was added to tube number 2 . Then, 100uL of tube number 2 was transferred to tube number 3 . What is the dilution of serum in tube number 3 ? A. 1/30 B. 1/15 C. 1/20 D. 1/24 E. 1/10

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