Remember that the following probability statement is true:
Given [tex]P(A)[/tex], the odds against [tex]P(A)[/tex] (defined as [tex]P(A^C)[/tex] are defined below:
[tex]P(A^C) = 1 - P(A)[/tex]
In this case, we are given the probability of picking a red marble, which we define as [tex]\frac{2}{7}[/tex]. The odds of picking against a red marble would then be:
[tex]1 - \frac{2}{7} = \frac{5}{7}[/tex]
Our answer is 5/7.
