Find the number of ways of selecting 9 balls from 6 red balls, 5 white balls and 5 blue balls if each selection consists of 3 balls of each colour.

Explanation

To solve the problem of selecting 9 balls from 6 red balls, 5 white balls, and 5 blue balls, with the condition that we must select 3 balls of each color, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Selection Requirement**:
We need to select a total of 9 balls, with exactly 3 balls from each color: red, white, and blue.

2. **Identifying the Combinations for Each Color**:
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