At work employees play a game called secret santa. Instead of drawing names from a hat,...
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At work employees play a game called secret santa. Instead of drawing names from a hat, they all sit at random in a circle and give a gift to the person sitting to their right or sitting to their left with 1/2-1/2 probalility. Find the expectation of the number of peo- ple who end up without a present if, at work there are 240 people who participate of the game. At work employees play a game called secret santa. Instead of drawing names from a hat, they all sit at random in a circle and give a gift to the person sitting to their right or sitting to their left with 1/2-1/2 probalility. Find the expectation of the number of peo- ple who end up without a present if, at work there are 240 people who participate of the game.
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