#### Case 1: 2 red, 1 green, 1 blue
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- ### Step 1: Total number of ways to choose 4 birds from 15:
- ### Step 2: Favorable outcomes — at least one of each color
- #### Case 2: 1 red, 2 green, 1 blue
- #### Case 3: 1 red, 1 green, 2 blue
- ### Step 3: Total favorable outcomes
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