If P(A)=2/3, P(B) = 1/6, and P (A and B)= 0, what can you say about P(A or B)?

P(A∪B) = P(A) + P(B) - P(A∩B)

This is the same process of combining members of two sets A and B.

Since the probabilty of A and B is zero, A and B cannot both happen at the same time. Therefore P(A or B) = P(A) + P(B) = 5/6