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Money in Water

Probability puzzles require you to weigh all the possibilities and pick the most likely outcome.

 

Puzzle ID:#3265
Fun:*** (2.44)
Difficulty:*** (2.19)
Category:Probability
Submitted By:cathalmccabe***
Corrected By:cowman12

 

 

 



You drop two coins into a muddy river by mistake. You saw one falling in, a 1 Euro coin. You know the other one had to be either a 1 Euro coin, or a 2 Euro coin.

After searching and pulling out one, and discovering it's a 1 Euro coin, what is the chance that the other is also a 1 Euro coin?





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