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Option 4 : 8 or 9

Rohit remembers that his birthday is before 12th December and after 6th December i.e.

Birthday is either on 7th, 8th, 9th, 10th, or 11th December.

His wife remembers that Rohit’s birthday is after 7th December i.e.

Birthday is either on 8th, 9th, 10th, or 11th December.

His son remembers that Rohit’s birthday is before 10th December i.e.

Birthday is either on 8th or 9th December.

Hence, Rohit’s birthday is either on 8th or 9th December.

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