Which condition is necessary for P(A∣B)+P(Ac∣B)=1P(A|B) + P(A^c|B) = 1P(A∣B)+P(Ac∣B)=1?
P(B)>0P(B) > 0P(B)>0
AAA and BBB are independent
P(A)>0P(A) > 0P(A)>0
Always true for any BBB with P(B)>0P(B)>0P(B)>0