Question

Sangeeta remembers that her father's birthday was certainly after eighth but before thirteenth of December. If her sister Natasha remembers that their father's birthday was definitely after ninth but before fourteenth of December, then on which date of December was their father's birthday?

• A. ${10}^{th}$
• B. ${11}^{th}$
• C. ${12}^{th}$
• D. Data inadequate

Answer 1

Answer: (D)

Data inadequate

According to Sangeeta, her Father's birthday lies on either $9,10,11,12$
But according to Natasha, it is on $10,11,12,13$
If we take the common dates of both the sisters, it is $10,11,12$
So, his birthday can lie in any of the three dates - $10,11,12$
$\therefore$ Data is insufficient.