From the following items: X, Y, Z, W, and V, the selection conditions are: 1) X and Y cannot be selected together. 2) Z must be selected if W is selected. 3) V can only be selected if X is not selected. Which of the following selections is valid?
In a family, there are three siblings: X, Y, and Z. X is older than Y but younger than Z. If Z is a doctor and Y is a teacher, what is X's profession if he is not a student?
In a cooking competition, five chefs X, Y, Z, W, and V prepare dishes. X finishes before Y but after Z. W finishes before V but after Y. What is the correct finishing order?