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Random Numbers With Constraints

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

 

Puzzle ID:#14822
Fun:*** (2.5)
Difficulty:*** (2.18)
Category:Probability
Submitted By:j72883*
Corrected By:Sunrose

 

 

 



One of ten different furbies was randomly placed into each box of some type of cereal. If a mother decided to buy this cereal for her children until she obtained at least one of each of the ten different furbies, what is the number of boxes of cereal that she is expected to purchase?


Hint

The probability of selecting a different toy is 1/10.
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