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					 Sangeeta remembers that her father's birthday was certainly after 8th but before 13th of December. Her sister Natasha remembers that their father's birthday was definitely after 9th but before 14th of December. On which data of December was their father's birthday?
 
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- 10th
 - 11th
 - 12th
 - Data inadequate
 
 
Correct Option: D
According to                 Birth Date
Sangeeta            9, 10, 11, 12
Natasha             10, 11, 12, 13
Hero, 10, 11 and 12 three dates are common. 
So, confirm date cannot be datermined.