Sunday, September 26, 2010
Fishes in a lake
There is an unknown number of fishes in a lake and you need to estimate them. You start fishing and you capture 50 fishes, then you mark them all with a special pen and throw them back in the water. You decide to start fishing again and you recapture 2 marked fishes. So how many fishes there are in the lake?
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depends on how many fishes captured overall for the second time
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