Find the total number of selections of at least one red ball from a bag containing 4 red balls and 5 black balls, balls of the same colour being identical.

Explanation

To solve the problem of finding the total number of selections of at least one red ball from a bag containing 4 red balls and 5 black balls (with balls of the same color being identical), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Given Values**:
- Number of red balls (R) = 4
- Number of black balls (B) = 5

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