To determine the Highest Common Factor (HCF) of 26 and 91, we follow the steps outlined below:
1. Find the factors of each number:
- Factors of 26: 1, 2, 13, 26
- Factors of 91: 1, 7, 13, 91
2. Identify the common factors:
- Common factors of 26 and 91: 1, 13
3. Choose the greatest common factor:
- The greatest common factor (HCF) among 1 and 13 is 13.
Therefore, the HCF of 26 and 91 is 13. So, the correct option is (b) 13.
