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Mathematics, 18.06.2021 14:00 mi364
Có 2 hộp bi, hộp bi 1 có 8 bi trắng 2 bi đỏ, hộp 2 có 6 bi trắng 4 bi đỏ. lấy ngẫu nhiên một bi từ từ hộp 1 rồi bỏ vào hộp 2 và từ đó lấy ra 2 bi.
a). tính xác suất để chọn được 2 bi đỏ
b). giả sử chọn được 2 bi đỏ. tính xác suất để bi bỏ sang từ hộp 1 là bi trắng
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Có 2 hộp bi, hộp bi 1 có 8 bi trắng 2 bi đỏ, hộp 2 có 6 bi trắng 4 bi đỏ. lấy ngẫu nhiên một bi từ t...
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