设随机变量Zn~B(n,p),n=1,2,其中0<p<1,[img src="https://img.haodaxue.net/uploadimg/image/20200609/20200609165937_50596.png" alt="" />=()
A.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0609/1591693222180518.png" />
B.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0609/1591693229566399.png" />
C.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0609/1591693235102859.png" />
D.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0609/1591693241799971.png" />
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正确答案: B 答案分析:无
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