[問題] 一題生日機率
有13人 "恰有"兩個人同月同日生日的機率
(一年365天)
我有算出"至少"是 1-365/365 * 364/365*......*353/365
請問恰有要怎麼算呢?
謝謝!
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推
04/14 21:24, , 1F
04/14 21:24, 1F
→
04/14 21:24, , 2F
04/14 21:24, 2F
推
04/14 21:31, , 3F
04/14 21:31, 3F
→
04/14 21:32, , 4F
04/14 21:32, 4F
推
04/14 21:39, , 5F
04/14 21:39, 5F
→
04/14 21:40, , 6F
04/14 21:40, 6F
推
04/14 21:40, , 7F
04/14 21:40, 7F
→
04/14 21:41, , 8F
04/14 21:41, 8F
→
04/14 21:42, , 9F
04/14 21:42, 9F
→
04/14 21:42, , 10F
04/14 21:42, 10F
推
04/14 22:12, , 11F
04/14 22:12, 11F