A committee of four members is to be formed from the following candidates: P, Q, R, S, and T. The selection criteria are: 1) P cannot be selected if Q is selected. 2) R must be included if S is included. 3) T can only be selected if P is not selected. Which of the following combinations is valid?
In a family of six members: P, Q, R, S, T, and U, the following relationships are given: P is the mother of Q. R is the father of S. T is the brother of U. Q is the sister of S. Who is the father of U?