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How is X related to Y?

Statements:

1. Y says, "I have only one brother".

2. X says, "I have only one sister".

  • A.1 alone is sufficient while II alone is not sufficient
  • B.2 alone is sufficient while I alone is not sufficient
  • C.Either 1 or I2 is sufficient
  • D.Neither 1 nor 2 is sufficient

Answer: D

Correct answer: Neither 1 nor 2 is sufficient

Statement 1 tells us Y has one brother and statement 2 that X has one sister, but neither says that X and Y are related to each other at all, nor gives the sex of either. Even together they leave the relationship undetermined, since X’s sister need not be Y and Y’s brother need not be X.

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