There are seven members in a family four males and four females A is wife of C C has two sons Q and ...........

Logical Reasoning(Master ) Data Sufficiency

There are seven members in a family, four males and four females. A is wife of C. C has two sons Q and B. T is the mother of R. How is R related to C?

I. S is the nephew of Q. B is married to D.

II. T is the sister in law of D. D is the wife of B.

III. R is the niece of B. B is the only sibling of Q.

Statement I and Statement II together are sufficient .

Any two statements together are sufficient.

Either statement (I) statement (II) together or statement (II) and statement (III) together is sufficient.

All the statement (I), statement (II) and statement (III) together are sufficient.

Only Statement (III) is sufficient.

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Master Data Sufficiency

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Explanation:

A is wife of C. C has two sons Q and B.

Statement I. S is the nephew of Q. B is married to D.
Inference: S is son of B. but we do not get information about R. so this statement is not sufficient.
Statement II. T is the sister in law of D. D is the wife of B.
Inference: T is the wife of Q. but no info of R, hence this is also not sufficient.
Statement III. R is the niece of B. B is the only sibling of Q.
This statement alone gives us the information that R is the daughter of Q and hence granddaughter of C. therefore statement alone is sufficient to answer the question.