Question

Calculate P(A or B) where A and B are mutually exclusive events and P(A) = 1 and P(B) =

Answer 1

1

Explanation:

If A and B are mutually exclusive and A is certain to happen, then B is certain to never happen, so P(B) = 0. The probability of either of two mutually exclusive events is the sum of their individual probabilities:

P(A or B) = P(A) +P(B) = 1 + 0

P(A or B) = 1