On which day of the week does Aarti's birthday fall?
I. Sonu correctly remembers that Aarti's birthday comes after Wednesday but before Sunday.
II. Raj correctly remembers that Aarti's birthday comes before Friday but after Tuesday.
If the data in both statements I and II together are necessary to answer the question
According to Sonu, birthday = Thursday/Friday/Saturday
According to Raj, birthday = Wednesday/Thursday.
∴ Possible day of birthday = Thursday
So, both the statements I and II are required to answer the question.