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Introducing a man, a woman said, "His wife is the only daughter of my father." How is that man related to the woman? 
 A.  Father–in–law
 B.  Husband
 C.  Maternal uncle
 D.  Brother
Answer : B.

Only daughter of my father – Myself.
So, the man is woman’s husband.
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A family consists of six members P, Q, R, X, Y and Z. Q is the son of R but R is not mother of Q. P and R are a married couple. Y is the brother of R. X is the daughter of P. Z is the brother of P. How many children does P have ? 
 A.  1
 B.  2
 C.  3
 D.  4
Answer : B.

Q is the son of R but R is not the mother.
So, R is the father of Q.
P is married to R. So, P is the wife of R and the mother of Q.
X is the daughter of P and hence of R and so she is the sister of Q.
Y is the brother of R and Z is the brother of P.
Hence, Q is the son of P and X is the daughter of P.
So, P has two children.
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A family consists of six members P, Q, R, S, T and U. There are two married couples. Q is a doctor and the father of T. U is grandfather of R and is a contractor. S is grandmother of T and is a housewife. There is one doctor, one contractor, one nurse, one housewife and two students in the family. What is the profession of P ? 
 A.  Nurse
 B.  Doctor
 C.  Contractor
 D.  Housewife
Answer : A.

Q, the Doctor, is the father of T.
S, the Housewife, is the grandmother of T and hence the mother of Q.
Since there are only two married couples one being that of Q, the grandfather of R i.e., U must be married to S.
Thus, R and T will be both children of Q and these must be the students.
So, P, who remains, shall be the wife of Q and she alone can be the nurse.

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