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Mathematics, 05.07.2021 01:50 londonpaige

Có hai hộp đựng các sản phẩm. Hộp 1 gồm 10 chính phẩm, 10 phế phẩm. Hộp 2 có 15 chính phẩm và 5 phế phẩm. Từ mỗi hộp lấy ngẫu nhiên 1 sản phẩm, các sản phẩm còn lại được dồn vào hộp 3. Tìm xác suất từ hộp 3 này lấy được chính phẩm

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Có hai hộp đựng các sản phẩm. Hộp 1 gồm 10 chính phẩm, 10 phế phẩm. Hộp 2 có 15 chính phẩm và 5 phế...
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