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Usenet Newsgroups : rec.puzzles Hall of Fame


The rec.puzzles Hall of Fame is a compilation of over 500 of the most popular puzzles that have been posted and discussed in the rec.puzzles newsgroup. In most cases a detailed solution has been provided.

Many of these puzzles also appear in Braingle's own collection.

   
rec.puzzles
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FAQ
Hall of Fame
alt.brain.teasers
Newsgroup
FAQ
Categories : probability : coupon.p

There is a free gift in my breakfast cereal. The manufacturers say that
the gift comes in four different colors, and encourage one to collect
all four (& so eat lots of their cereal). Assuming there is an equal
chance of getting any one of the colors,  what is the expected number
of boxes I must consume to get all four?  Can you generalise to n
colors and/or unequal probabilities?


Solution

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