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Another group of students (group 3) sampled water from a different source. They diluted 10 mL...

Another group of students (group 3) sampled water from a different source. They diluted 10 mL of water sample with 990 mL of sterile water. Then now filtered 100 mL of the diluted sample through a membrane filter. Upon incubation on mFC plate they saw 200 blue colonies. Calculate the CFU/100 mL of the original water sample. SHOW YOUR WORK. Compare their results to the one obtained in group 1.

I did the C1V1 = C2V2 formula twice for this problem but got a result of 2,000CFU/mL but that's too high and doesn't make sense. Can someone help me with this?

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