Derangements and Hats (TANTON Mathematics)
Автор: DrJamesTanton
Загружено: 2010-12-18
Просмотров: 12578
Описание:
A lazy teacher hands 20 graded assignments back to his 20 students - randomly. What is the probability no student receives her own paper? A hat check clerk forgets who handed in which hat and so decides to return them at random. What are the chanced no-one receives his own hat?
In this video we find a formula for the number of derangements of N objects and show the classic appearance for the number e.
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