问答题

事件A-B可表示为(    ).
   A. B.
   C.AB D.A-AB E.

A.

B.C.174.24.96:6088/Latex/latex.action?latex=XG92ZXJsaW5le0F9Qg%3D%3D'
D.E.174.24.96:6088/Latex/latex.action?latex=QVxvdmVybGluZXtCfQ%3D%3D'
F.AB
G.A-AB
H.I.174.24.96:6088/Latex/latex.action?latex=QUItQVxvdmVybGluZXtCfQ%3D%3D'
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