Please explain this question, step-by-step. Thank you. This is the question: Let A and B be the events. The difference is defines to be the set of all elements of B that are not in A. Show that if A is in B then P(B-A)=P(B)-P(A) directly using the axioms of probability.

42. Let A and Bbe events. The dierence B A is dened to be the set of all elements of B that are not in A. Show that if A Q B, then pa; A) = 10(3) - PM), directly using the axioms of probability