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brandon436
23.06.2021 •
Mathematics
Một hộp gồm 7 thẻ xanh đánh số từ 1-7 và 3 thẻ vàng đánh số từ 1-3. Chọn ngẫu nhiên 1 thẻ từ hộp. Tính xác suất được thẻ đánh số chẵn, biết rằng đã được thẻ xanh
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