A family consists of a mother, a father, and three children: P, Q, and R. P is the eldest child and is a doctor. Q is a teacher and is younger than P but older than R. What is R's profession if all children have different professions?
In a circular seating arrangement, A is sitting to the immediate right of B, who is sitting opposite C. D is sitting to the immediate left of A. Who is sitting opposite D?
From the following items: P, Q, R, S, and T, the selection rules are: 1) P cannot be selected if Q is selected. 2) R must be selected if S is selected. 3) T can be selected only if P is not selected. Which of the following selections is valid?