Mathematics, 23.06.2021 19:50 abbie722

Một hộp đựng 10 viên bi, trong đó có 2 viên bi đỏ. Chọn ngẫu nhiên không hoàn lại lần lượt từng viên bi cho đến khi nhận được 2 viên bi đỏ thì dừng. Tính xác suất để việc chọn bi dừng lại ở lần thứ ba

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Một hộp đựng 10 viên bi, trong đó có 2 viên bi đỏ. Chọn ngẫu nhiên không hoàn lại lần lượt từng viên...

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