Final answer:
The probability of not drawing a silver ball, when the probability of drawing a silver ball is 1/3, is 2/3.
Step-by-step explanation:
The probability of not drawing a silver ball can be found by subtracting the probability of drawing a silver ball from 1, since the sum of the probabilities of all possible outcomes must equal 1. If the probability of drawing a silver ball is 1/3, then the probability of not drawing a silver ball is 1 - 1/3 = 2/3.