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Data Sufficiency - Verbal and Reasoning

Q1:

Question: How is A related to D ? Statements:
  1. B is the brother of A.
  2. B is D's son.

A I alone is sufficient while II alone is not sufficient

B II alone is sufficient while I alone is not sufficient

C Either I or II is sufficient

D Neither I nor II is sufficient

E Both I and II are sufficient

ANS:D - Neither I nor II is sufficient

Explanation: From I and II, we conclude that A is either son or daughter of D.