In coded relation type questions, the relationships are represented by certain codes or symbols such as + , - , ÷ , × , * etc. Then relationships between certain persons, given in the form of these codes, are to be analysed.
A + B means A is the daughter of B ;
A x B means A is the son of B and
A - B means A is the wife of B.
If T - S x B - M, which of the following is not true ?
T - S x B - M means T is the wife of S who is the son of B who is the wife of M i.e. T is the wife of the son of M (father) i.e. T is the daughter-in-law of M.
But as this is not given in the choice, so the fact in (d) derived from S x B is true.