A girl introduced a boy as the son of the daughter of the father of her uncle. The boy is girl`s

A. BROTHER

If P + Q means P is the husband of Q ;
P / Q menas P is the sister of Q  and
P x Q means P is the son of Q,
which of the following shows A is the daughter of B ?

D. A / D X B

A and B are brothers. C and D are sisters. A's son is D's brother.
How is B related to  C ?

D. UNCLE

(I).   A, B, C, D, E and F are six members of a family.
(II).  One couple has parents and their children in the family.
(III). A is the son of C and E is the daughter of A.
(IV). D is the daughter of F who is the mother of E. Who are the male members in the family ?

D. CANNOT BE DETERMINED

Salesman, Engineer and Accountant. There are two married couples in the family. D, the Salesman is married to the Lady Teacher. The Doctor is married to the Lawyer. F, the Accountant is the son of B and brother of E. C, the Lawyer is the daughter-in-law of A. E is the unmarried Engineer. A is the grandmother of F. Which of the following is one of the couples ?

E. NONE OF THESE