In a certain code, ‘A * B’ means ‘A is the father of B’; ‘A & B’ means ‘A is the wife of B’; ‘A ! B’ means ‘A is the sister of B’; ‘A ? B’ means ‘A is the brother of B’. Which of the following expressions means that P is the aunt of S?
Correct answer B. P ! Q * R ! S
Explanation
In P ! Q * R ! S, P is the sister of Q, Q is the father of R, R is the sister of S, so P is the aunt of S. The other expressions make P the grandfather, uncle or great-grandfather of S.
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