The probability that event $\displaystyle {A}$ will occur is $\displaystyle {P}{\left({A}\right)}=$0.8.

What is the probability (in decimal form) that event $\displaystyle {A}$ will not occur? $\displaystyle {P}{\left(\overline{{{A}}}\right)}=$

What are the odds for event $\displaystyle {A}$? to

What are the odds against event $\displaystyle {A}$? to

Simplify your answers.