You have an eppendorf tube containing 1mL of solution with 4.3 x 10^4 cells/mL and you are to produce a solution that contains 43 cells/mL. What dilutions must you perform?
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To go from 4.3e4 to 4.3e1, you must dilute 1000x. If you're using an Eppendorf, it's easy to do 0.1ml + 99.9ml.