In a certain code, ‘A < B' means 'A is the father of B'; 'A > B’ means ‘A is the brother of B’; ‘A = B’ means ‘A is the husband of B’; ‘A ~ B’ means ‘A is the sister of B’. Which of the following expressions means that P is the grandfather of S?
Correct answer A. P < Q > R < S
Explanation
In P R < S, P is the father of Q, Q is the brother of R, R is the father of S, so P is the grandfather of S. The other expressions make P the aunt, uncle or father-in-law of S.
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