• 2022-06-12
    题目包含多个选项,但学生只能选择一个答案。
    设A,B,C表示三个随机事件,请问下列事件应如何用A,B,C表示
    (2)、$A,B,C$至少两个发生
    A: ${(ABC)}\cup{(\bar{A}BC)}\cup{(A\bar{B}C)}\cup{(AB\bar{C})}$
    B: ${(\bar{A}BC)}\cup{(A\bar{B}C)}\cup{(AB\bar{C})}$
    C: ${A}\cup{B}\cup{C}$
    D: ${(\bar{A}\bar{B}\bar{C})}\cup{(\bar{A}B\bar{C})}\cup{(\bar{A}\bar{B}C)}\cup{(A\bar{B}\bar{C})}$
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