Factors of: \( 68=1,2,4,17,34,368 \) \( 72=1,2,3,4,5,8,9,12,18,24,36\} 372 \) \( 42=1,2,3,6,7,14,21\} 42 \) \( H(F= \)

It seems like you're looking for the factors of the numbers 68, 72, and 42, and possibly the highest common factor (HCF) or greatest common divisor (GCD) of these numbers. Let's clarify the factors and then find the HCF. ### Factors: 1. **Factors of 68**: - The correct factors are \(1, 2, 4, 17, 34, 68\). 2. **Factors of 72**: - The correct factors are \(1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72\). 3. **Factors of 42**: - The correct factors are \(1, 2, 3, 6, 7, 14, 21, 42\). ### Finding the HCF: To find the HCF, we look for the common factors among the three numbers. - **Common factors of 68, 72, and 42**: - The factors of 68: \(1, 2, 4, 17, 34, 68\) - The factors of 72: \(1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72\) - The factors of 42: \(1, 2, 3, 6, 7, 14, 21, 42\) The common factors are \(1\) and \(2\). ### Highest Common Factor (HCF): The highest common factor is \(2\). Thus, the HCF of 68, 72, and 42 is \( \boxed{2} \).