ALGEBRA
posted by Urgen please help .
Find the requested probabilities.
$$ P(\overline{A}) \ \text{if} \ P(A) = {\color{red}0.9} $$
P(A) =

If I understand correctly, we are given
P(A')=0.9
Since P(A)+P(A')=1 (sample space), we should get P(A)=?