There are 4 romantic novels and 6 adventurous novels on a book shelf. Without looking, Carmen chooses two novels out of the shelf. What is the probability that she chooses 2 romantic novels?

4 Romance books

6 Adventure books
==================
10 Total books

The chance she will get one romance book 4/10.
The chance she will get another romance book becomes 3/9.

By multiplication, (4x3)/(10x9) = 2/15, or 0.1333 or 13.33%

-Hope this helps.