Final answer:
The probability of drawing a red ball is 1/4, the probability of not drawing a red ball is 3/4, and the probability of drawing a green ball is 0.
Step-by-step explanation:
To find the probability of an event, we divide the number of favorable outcomes by the number of total outcomes.
Given that there are 5 red balls, 9 white balls, and 6 yellow balls in the jar,
(a) P(A red ball is drawn) = 5/20 = 1/4
(b) P(The ball drawn is NOT red) = 15/20 = 3/4
(c) P(A green ball is drawn) = 0/20 = 0