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Challenge 52: Capture-Recapture How many fish in the pond
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in the pond
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To estimate the number of fish in a pond, scientists captured 150 fish, marked them, and then let them go. The next day, they captured 170 fish from the pond. Of these, 20 had been marked the day before. About how many fish are in the pond?
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Most people throughout history have created designs and patterns to express their cultures. Many such designs also feature an underlying mathematical pattern. Studying mathematical designs and patterns helps archaeologists and anthropologists understand a

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