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Data Sufficiency - Verbal and Reasoning

Q1:

Question: How is T related to K? Statements:
  1. K has two sons; one of the sons is A.
  2. The mother of T has only two sons - Aand B.

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:E - Both I and II are sufficient

Explanation: From II, we know that T's mother has only two sons, A and B. This implies that T is the sister of both A and B. But, from I, A is also K's son. So, T is the daughter of K.