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Is D brother of F ? I. B has two sons of which F is one. II. D's mother is married to B.

If the data in statement I alone are sufficient to answer the question
If the data in statement II alone are sufficient answer the question
If the data either in I or II alone are sufficient to answer the question;
If the data in both the statements together are needed.

Correct Answer: If the data in both the statements together are needed.

Explanation:

From I, we conclude that F is the son of B.

From II, we conclude that B's wife is D's mother.

This means that D and F are the sons of B and D is the brother of F.

So, both I and II are required.

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