A group of six people: P, Q, R, S, T, and U have the following selection criteria: 1) P and Q must be selected together. 2) R cannot be selected if S is selected. 3) T must be selected if U is selected. Which of the following combinations meets these criteria?
From the set of items: X, Y, Z, A, and B, the following rules apply: 1) X and Y cannot be selected together. 2) If Z is selected, A must also be selected. 3) B can only be selected if Y is not selected. Which selection is permissible?
In a group of five friends: Alice, Bob, Charlie, David, and Eva, Alice is taller than Bob but shorter than Charlie. David is shorter than Eva but taller than Bob. Who is the tallest among them?