Explanation:
given data:
total marbles = 75
red marble = 10
white marble = 30
blue marble = 20
orange marble = 15
solution:
a. Probability of drawing an orange or red
= 15/75 + 10/75
= 1/3
b. probability of not drawing a red or blue
= 1 - 20+10/ 75
= 3/5
c. Not blue
= 1 - p
= 1 - 20/75
= 11/5
d. Probability of drawing a white
= 30/75
= 2/5
e = red, white or blue
= 10/75 + 30/75 + 20/75
= 4/5