A technician wanted to determine lactose-fermenting bacteria ina drinking water sample. So, he filtered 100 mL of the sample in amembrane filtration unit that does not allow the passage ofbacteria. The filter paper was put on the surface of MacConkeyagar. After incubation, he observed 2 red colonies and 4 colorlesscolonies. How many lactose-fermenting bacteria are there per 100mLof drinking water?
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