[問題] 集合論‥(答案)
ex:
P(B)=0.4，P(C)=0.6，P(A∩B)=0.2，P(A∩C)=0.3，P(B∩C)=0
，請問P(A)等於何值??
(a.)0.2 (b.)0.3 (c.)0.4 (d.)0.5 (e.)以上皆非
我覺得是以上皆非，
根據
P(A∪B∪C)=P(A)+P(B)+P(C)-P(A∩B)-P(B∩C)-P(A∩C)+P(A∩B∩C)
全部都帶入，令=1, 結果是0，我覺得這答案怪怪的，請問哪裡有錯~
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