Odds


[Probability](https://texonom.com/probability-6b1e766c2c6442c7a599b558453300e4) 
20% is 1/5 and 1:4 odds

$$O()$$



> [The medical test paradox, and redesigning Bayes' rule](https://www.youtube.com/watch?v=lG4VkPoG3ko)





