you want me to do step by step or just tell you the answer?
Step-by-step explanation:
Answer: 
Step-by-step explanation:
Given
The odds against winning in a chess tournament are 1 to 11.
Odds is defined as the ratio of the probability of occurrence to the non-occurrence of event.

Probability of non-occurrence i.e. she wins the first prize is

Answer:
40(?)
I don't remember exactly if that's correct, but I hope it's right! Comment if you want the explanation