Hãy xác định giá và lượng cân bằng thị trường có ba hàng hóa hàm cung và hàm cầu của mỗi loại hàng như sau : hàng hóa 1 Qs1 =20p1 - p2 - 4p3 + 34, Qd1 = 112-10p+4p2+2p3 hàng hóa 2 Qs2 = -p1 + 8p2 - 5p3 + 92 , Qd2 = 123 + p1 - 7p2 +2p3 hàng hóa 3 Qs3 = - p1 - p2 + 6p3 + 69 , Qd3 = 86 + p1 + 3p2 - 2p3

Which of the following are independent events? a) knowing that it is going to rain tomorrow, and bringing an umbrella to schoolb) knowing that you have to get up early tomorrow, and going to bed before 9 p. mc) knowing that it is going to rain tomorrow, and going to bed before 9 p. md) knowing that you have a test in school tomorrow, and studying thw night before