Addition Rule
If A 
B ≠ 
.
p(A 
B) = p(A) + p(B) − p(A B)
p(A B C) = p(A) + p(B) + p(C) − p(A B) − p(A C) − p(B C) + p(A B C)
Example
Calculate the probability of rolling a multiple of 2 or a 6 when rolling only one die (singular for dice).
Addition Rule for Mutually Exclusive Events
If A B = .
p(A B) = p(A) + p(B)
Example
Calculate the probability of getting a 2 or 5 when rolling a die.
