Please explain each part and especially the third part

(1 point) Rework problem 4 trom section 3.4 ot your text, involving probabilities on a tree diagram. Construct a copy otfigure 3.17 in your text, where the first outcome is one ot X, Y, and Z, and the second outcome in each case is one of A and a. use the following probabilities instead orthose given in your text Pr[X] Pr[Y] Pr[Z] Pr[AIXl Pr[BIXJ Pr[AIYl Pr[BIY] Pr[AIZ] Pr[BIZ] Find the following missing probabilities: (1) Pr[BIY] (2) Pr[YIB]