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Question: How is X related to Y? Statements: Y says, "I have only one brother". X says, "I have only one sister".

I alone is sufficient while II alone is not sufficient
II alone is sufficient while I alone is not sufficient
Either I or II is sufficient
Neither I nor II is sufficient
Both I and II are sufficient

Correct Answer: Neither I nor II is sufficient

Explanation:

The statements in I and II do not provide any clue regarding relation between X and Y.

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