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Question: On which day of the week was birthday of Sahil? Statements: Sahil celebrated his birthday the very next day on which Arun celebrated his birthday. The sister of Sahil was born on the third day of the week and two days after Sahil was born.

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: II alone is sufficient while I alone is not sufficient

Explanation:

I does not mention the day of the week on the birthday of either Arun or Sahil.

According to II, Sahil's sister was born on Wednesday and Sahil was born two days before Wednesday i.e. on Monday.

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