Come every Monday, something will puzzle you. Come every Monday, something will challenge you. Come every Monday, something will sound interesting. Come every Monday, the beauty of the random world will engage you!
So, come every Monday.

Monday, June 28, 2010

Monday Probability 25: Pairs

A row has a+b chairs. A group has 'a' girls and 'b' boys who sit on the chairs randomly. What is the expected number of pairs (a girl and a boy sitting next to each other)?

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