You have a culture that contains 10^8 (ten to the eighth) bacteria and you serially dilute that culture twice at dilution factor of 1:

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You have a culture that contains 10^8 (ten to the eighth) bacteria and you serially dilute that culture twice at dilution factor of 1:1000. When you plate 1 tenth of a mL of that final culture onto a plate, how many colonies do you expect to see the next day?