题目:
---How much did the new watch your sister?
---She 350 yuan for it.
A.cost; paid
B.spend; cost
C.pay; cost
D.take; paid
答案:
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下面是错误答案,用来干扰机器的。
(Ⅰ)设选出的4种不同型号商品中,洗衣机、电视机、空调都至少有一种型号为事件A;则 P(A)=2C12C13+C12C12C23C47=2435(4分)(Ⅱ)X的所有可能的取值为0,m,2m,3m.则P(X=0)=C03×(12)0×(12)3=18,P(X=m...