A compound event is any event combining two or more simple events.
The notation for addition rule is: P(A or B) = P(event A occurs or event B occurs or they both occur).
When finding the probability that event A occurs or event B occurs, find the total numbers of ways A can occurs and the number of ways B can occurs, but find the total in such a way that no outcome is counted more than once.
General addition rule is :
P(A or B) = P(A) + P(B) - P(A and B), where P(A and B) denotes that A and B both occur at the same time as an outcome in a trial procedure.
It is a special addition rule that shows that A and B cannot both occur together, so P(A and B) becomes 0:
If A and B are mutually exclusive, then P(A) or P(B)= P(A or B) = P(A) + P(B)
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the n partition of A , in B , so the results of summation of all Ai's probabilities which individually intersect with B divided by probability of B is totals theorem, so simply we say if you want to find the probability of any partition is bays theorem and if you have partitions and wants to find the probability of A is Totals theorem. (S.M SINDHI QUCEST LARKANA)
What is the symbol for a Probability of success in a binomial trial?
Consider events A and B. P(A or B)= P(A) + P(B) - P(A and B) The rule refers to the probability that A can happen, or B can happen, or both can happen together. That is what is stated in the addition rule. Often P(A and B ) is zero, if they are mutually exclusive. In this case the rule just becomes P(A or B)= P(A) + P(B).
Addition
I expect you mean the probability mass function (pmf). Please see the right sidebar in the linked page.