Probability math

Question

a) P(A or B) = p(A) + p(b)

P(A) = 0.04

P(B) = 0,025

P(A or B) = 0,04 + 0,025 = 0,065

b) Still don't know the answer to b. I hope some of you could give me the answer. and the way you came to the answer

Answer 1

Where is question b?

Also, P(A or B) = P(A) + P(B) is only true if events A and B are mutually exclusive. This formula is not true in general!