You have the next set: Total of marbles in the bag:
[tex]\begin{gathered} \lbrace r,r,r,r,r,r,r,r,r,r,r,r,r,r,y,y,y,y,y,y,b,b,b\rbrace \\ \\ \end{gathered}[/tex]Where r is red marble, y is yellow marble and b is blue marble.
Yu have in total 23 marble in the bag.
T=23
The next set is the marble that are red or blue:
[tex]\lbrace r,r,r,r,r,r,r,r,r,r,r,r,r,r,b,b,b\rbrace[/tex]Then, 17 marble are red or blue.
Then, the probability of drawn from the bag a marble red or blue is: Approximate 0.74
[tex]P=\frac{17}{23}\approx0.739[/tex]