Answer: Our required probability is [tex]\dfrac{11}{20}[/tex]
Step-by-step explanation:
Since we have given that
Number of red marbles = 8
Number of blue marbles = 2
Number of yellow marbles = 7
Number of green marbles = 3
So, Total number of marbles = 8 + 2 + 7 + 3 = 20
So, Probability for selecting a red marble and then selecting a green marbles is given by
P(red) + P(green) is equal to
[tex]\dfrac{8}{20}+\dfrac{3}{20}\\\\=\dfrac{8+3}{20}\\\\=\dfrac{11}{20}[/tex]
Hence, our required probability is [tex]\dfrac{11}{20}[/tex]
