You serially dilute a stock of bacteriophage by, Ask an Expert

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You serially dilute a stock of bacteriophage by sequentially taking: 10 ul into 1 ml, 10 ul into 1 ml, 100 ul into 0.9 ml and plating 0.1 ml on a sensitive strain of bacteria. You later count 65 plaques on that plate. How many phage per ml were in the original stock?

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