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Với một chiếc tivi được chọn ngẫu nhiên, trong các đại lượng sau, đâu là biến ngẫu nhiên rời rạc:X = "Trọng lượng chiếc tivi"Y = "Chiều dài chiếc tivi"Z = "Thời gian hoạt động của chiếc tivi"W = "Số kênh có thể nhớ của chiếc tivi"

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