Answer:
[tex]\frac{8}{19}[/tex]
Step-by-step explanation:
There are [tex]3 + 5 + 4 + 7 = 19[/tex] marbles.
There are 3 red marbles and 5 green marbles.
Odds of picking red are [tex]\frac{3}{19}[/tex]
Odds of picking green are [tex]\frac{5}{19}[/tex]
Picking red or green is just adding probabilities.
[tex]\frac{3+5}{19} =\frac{8}{19}[/tex]
