Q: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Greg Sanders: Cath ? Your DNA results are back . According to my DNA data , the chances are 814 quadrillion to _ one _ - that your suspect is our killer . Pretty good stats ...
Catherine Willows: Yeah , considering there are only six billion people in world .
A:
chances