Two balls drawn from an urn containing `2` white, `3` red and `4` black balls one by one without replacement. What is the probability that at least one ball is red?

Explanation

To find the probability that at least one ball drawn from an urn containing 2 white, 3 red, and 4 black balls is red, we can use the complementary approach. This means we will first calculate the probability of the complementary event (no red balls drawn) and then subtract it from 1.

### Step-by-Step Solution:

1. **Identify Total Balls**:
The total number of balls in the urn is:
\[
2 \text{ (white)} + 3 \text{ (red)} + 4 \text{ (black)} = 9 \text{ balls}
...