Encoded relations (+ = brother, % = father, × = sister): Choose the expression where M is the uncle of P. Meanings: A + B ⇒ A is brother of B; A % B ⇒ A is father of B; A × B ⇒ A is sister of B. Select the option that makes M the (paternal) uncle of P (brother of P’s father/mother).

Decode options

• M % N × P: M father of N; N sister of P ⇒ M becomes father (not uncle) of P — incorrect.
• N × P % M: N sister of P; P father of M ⇒ P is parent of M — no uncle relation — incorrect.
• M + S % R % P: M brother of S; S father of R; R father of P ⇒ M is brother of P’s grandfather (grand-uncle) — incorrect.
• M + K % T × P: M brother of K; K father of T; T sister of P ⇒ K is also P’s father (siblings T and P share K); therefore M is K’s brother ⇒ M is P’s uncle.