题目
3.设A和B是任意两互不相容事件，且P(A)>0，P(B)>0，则必有( ).A. P(Acup overline (B))=P(overline (B))B. overline (A.)和overline (B.)相容C. overline (A)和overline (B)不相容D. P(Aoverline (B))=P(B)
3.设A和B是任意两互不相容事件，且P(A)>0，P(B)>0，则必有( ).
A. $P(A\cup \overline {B})=P(\overline {B})$
B. $\overline {A.}$和$\overline {B.}$相容
C. $\overline {A}$和$\overline {B}$不相容
D. $P(A\overline {B})=P(B)$
题目解答
答案
A. $P(A\cup \overline {B})=P(\overline {B})$