Mathematics, 17.10.2021 17:50 eichlingkera13

Một hộp dựng 9 cái bánh ngọt và 6 cái bảnh mặn. Lấy ngẫu nhiên lần lượt không hoàn lại hai cãi bánh từ hộp đó. Tính xác suất để. a) Hai bánh được lấy ra đều là bình ngon. b) Binh được lấy lần thứ hai là bánh ngọt.

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Một hộp dựng 9 cái bánh ngọt và 6 cái bảnh mặn. Lấy ngẫu nhiên lần lượt không hoàn lại hai cãi bánh...

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