Answer:
The probability of the person to draw a blue or green marble is 2/5.
Explanation:
In order to solve this, you need to know how many blue and green marbles are together. So in this case, 3 green marbles plus 5 blue marbles equals 8 green or blue marbles. You then have to know the total amount of marbles for all colors. So, 3+4+5+8=20 marbles. You then put the fraction as 8/20. This is representing that there are only 8 marbles out of 20 marbles. So then after you find the fraction, you simplify the fraction to 2/5.
Therefore, your answer is 2/5.