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Mathematics, 21.06.2021 05:20 ellarose0731
Một hộp đựng 10 phong bì bốc thăm trúng thưởng, trong đó có 3 phong bì đựng 500 nghìn
và 7 phong bì đựng 100 nghìn. Bốc ngẫu nhiên liên tiếp hai phong bì. Nếu biết phong bì thứ hai có
500 nghìn, tìm xác suất để phong bì đầu tiên cũng có 500 nghìn?
![ansver](/tpl/images/cats/User.png)
Answers: 3
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Một hộp đựng 10 phong bì bốc thăm trúng thưởng, trong đó có 3 phong bì đựng 500 nghìn
và 7 phong bì...
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