答案
1.
$B\subset A$とすると，
P[A|B^c]\neq 0,\ P[A|B]=1
より題意を満たす．
2.
$A\subset C$とすると，
P[C|A]=1
より題意を満たす．
参考文献
- 『現代数理統計学の基礎』(久保川達也 著)
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