1. **State the problem:** We have a bag containing 29 balls numbered from 1 to 29. 2. **What is asked?** Find the probability of choosing a ball numbered 30. 3. **Recall the probability formula:** $$\text{Probability} = \frac{\text{Number of favorable outcomes}}{\text{Total number of possible outcomes}}$$ 4. **Analyze the problem:** Since the balls are numbered 1 through 29, there is no ball numbered 30 in the bag. 5. **Calculate the number of favorable outcomes:** Number of balls numbered 30 = 0 6. **Calculate the total number of possible outcomes:** Total balls = 29 7. **Apply the formula:** $$\text{Probability} = \frac{0}{29} = 0$$ 8. **Interpretation:** The probability of choosing a ball numbered 30 is 0 because such a ball does not exist in the bag. **Final answer:** $$\boxed{0}$$