0.9
1) Assuming that these Probabilities refer to mutually exclusive events, i.e. there are no common elements from A and B.
2) We can write out:
P(A or B) = P(AUB)
P(AUB) = P(A) + P(B) Plugging into that the given data:
P(AUB) = 0.65 + 0.25
P(AUB) = 0.9
3) Hence, the answer is 0.9
