Answer preview
This appears to be a dilution calculation or colony counting problem where decimal placement is crucial. The key is identifying whether you're working with serial dilutions or direct counts, and checking your multiplication factors carefully.
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How to approach this question
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Step 1: Identify the type of calculation (dilution factor, colony count, or concentration)
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Step 2: Verify your dilution series and multiplication factors
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Step 3: Apply significant figures rules and check units for final answer