A dice is thrown randomly. What is the probability that the number shown on the dice is not divisible by 3?

Question: A dice is thrown randomly. What is the probability that the number shown on the dice is not divisible by 3?

Solution:
Numbers on dice are {1, 2, 3, 4, 5, 6}
Numbers on dice not divisible by 3 are {1, 2, 4, 5}
Number of favorable outcomes = 4
Total possible outcomes = 6

∴ The probability that the number shown on the dice is not divisible by 3 is 4/6 = 2/3