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How many sons does D have ? I. A's father has three children. II. B is A's brother and son of D.

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 even in both the statements together are not sufficient to answer the question

Correct Answer: If the data even in both the statements together are not sufficient to answer the question

Explanation:

From both I and II together, we can conclude that A and B are the children of D, but the sex of A and the third child of D is not known. So, both the statements together are also not sufficient to answer the question.

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