1. Problem: Given the options 72, 54, 60, and 42, we need to identify the problem or find a relevant solution based on these numbers. 2. Since no explicit question is provided, let's consider a common problem: finding the greatest common divisor (GCD) of these numbers. 3. The formula for GCD of multiple numbers is the largest positive integer that divides all the numbers without leaving a remainder. 4. Calculate GCD step-by-step: - GCD(72, 54): Factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72 - Factors of 54 are 1, 2, 3, 6, 9, 18, 27, 54 - Common factors: 1, 2, 3, 6, 9, 18 - So, GCD(72, 54) = 18 5. Next, find GCD(18, 60): - Factors of 60 are 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60 - Common factors with 18: 1, 2, 3, 6 - So, GCD(18, 60) = 6 6. Finally, find GCD(6, 42): - Factors of 42 are 1, 2, 3, 6, 7, 14, 21, 42 - Common factors with 6: 1, 2, 3, 6 - So, GCD(6, 42) = 6 7. Therefore, the greatest common divisor of 72, 54, 60, and 42 is $6$. 8. Answer: $6$