Suppose that an experiment has four possible outcomes: A, B, C, and D. If P(A) = P(B) = P(C) and
P(D) = 2P(A), what is the probability of each event?
Is the answer:
P(A) = P(B) = P(C) =1/4, P(D) =1/2
No, that is not the answer. The sum of the probabilities must be 1. In your case it is 1.25.
Take 4/5 of each of your numbers for the right answer.