Work efficiency multiplied by work time is equal to the total amount of work

Work efficiency multiplied by work time is equal to the total amount of work


I don't know what you mean. Any three letters can represent these three meanings



What is the probability p (AB) equal to?


For any event P (AB) = P (a) - P (a non B) P (AB) = P (b) - P (non AB)
If a and B are independent, P (AB) = P (a) P (b)
When p (a) > 0, P (AB) = P (a) P (B | a)
When p (b) > 0, P (AB) = P (b) P (a | b)



What is the probability event (a-b) + (B-A) equal to


(A-B)+(B-A) =(A-A∩B) + (B- A∩B) = (A∪B)-(A∩B)