Answer
Add the 2 events probabilities
Work Step by Step
Mutually exclusive events cannot occur at the same time
Thus you add 2 events probabilities and the resulting probability is P(A or B) = P(A)+P(B)
An example would be pulling a queen or pulling a king from a deck of 52 cards, as you cannot do both at the same time.
Probability of pulling a king P(A) 4/52=1/13
Probability of pulling a queen P(B) 4/52=1/13
Probability of pulling a king or queen P(A or B) = P(A)+P(B) = 1/13+1/13= 2/13
