Answer:
"When applying the special rule of addition for mutually exclusive events, the joint probability is 0."
Explanation:
Mutually exclusive events are those events that cannot occur at the same time.
That is, if events A and B are mutually exclusive then their joint probability is 0.
The addition rule of probability is:
P (A or B) = P (A) + P (B) - P (A and B)
If A and B are mutually exclusive then, P (A and B) = 0.
Thus, the complete statement is:
"When applying the special rule of addition for mutually exclusive events, the joint probability is 0."