xxaurorabluexx
09.08.2021 •
Mathematics
Một hộp có 15 sản phẩm, trong đó có 10 sản phẩm mới, 5 sản phẩm cũ. Một người chọn ngẫu nhiên 3 sản phẩm từ hộp, chia làm hai lần. Lần thứ nhất lấy ra 2 sản phẩm (không trả lại hộp), lần thứ hai lấy ra một.
a) Tìm xác suất sản phẩm lấy ra lần hai là sản phẩm mới.
b) Biết sản phẩm lấy ra lần hai là sản phẩm cũ, tìm xác suất hai sản phẩm lấy ra lần đầu có một mới, một cũ.
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Ответ:
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Step-by-step explanation:
Ответ:
-10
Step-by-step explanation:
hope this can help :)