The greatest common factor (GCF) of 9, 6, and 15 is 3.
To find the GCF, we first need to list out the factors of each number:
- Factors of 9: 1, 3, 9
- Factors of 6: 1, 2, 3, 6
- Factors of 15: 1, 3, 5, 15
Next, we identify the common factors from these lists. The common factors of 9, 6, and 15 are 1 and 3. Among these, the greatest common factor is 3. Thus, the GCF of 9, 6, and 15 is 3.