A-B means A is the father of B. A+B means A is the daughter of B. $$A\div B$$ Means A is the son of B. $$A\times B$$ means A is the wife of B . Then, what is the relation of P with T in the expression P+S-T?
P + S means P is the daughter of S and S - T means S is the father of T.Thus S is the father of both P and T.∴P is the sister of T.
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