Final answer:
If a, b, and c are prime numbers, there is no common factor greater than 1 between (a + b) and c.
Step-by-step explanation:
To determine if (a + b) and c have a common factor greater than 1, we need to consider the prime factorization of each number. If a, b, and c are prime numbers, then their prime factorizations would consist of only the numbers themselves. For example, if a = 2, b = 3, and c = 5, (a + b) = 2 + 3 = 5 and there is no common factor greater than 1.