There are 8 Olympic Games volunteers, among whom volunteers A1A2A3 is proficient in Japanese, B1B2B3 is proficient in Russian, and C1C2 is proficient in Korean.

The probability of A1 being selected is 33.3 - a Japanese volunteer must be selected from 3 people, so the probability is 1/3;

B1 and C1 are not all selected Probability 83.3 - The selection of Japanese volunteers does not affect the selection of Russian and Chinese volunteers, so only the combinations of B and C are considered: B1C1, B1C2, B2C1, B2C2, B3C1, B3C2. The probability that both B1 and C1 are selected is 1/6, which is 16.7, so the probability that both B1 and C1 are not selected is 83.3.