[問題] 可以問翻譯嗎...
For a group of 100 people, compute
(a) the expected number of days of the year
that are birthdays of exactly 3 people:
(b) the expected number of distinct birthdays.
(a)是問說三個人在同一天生日的期望值嗎?
(b)應該是一百個人生日都不同天的期望值吧?
(b)expection = 100 * (1 * 364 * 363 * ... * 266) ?
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365 365 365
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