If GCD of two numbers (both integers, greater than 1) is 1, then which of the following must be true?
1. They are prime.
2. They are consecutive.
3. They do not have a common prime factor
4. They do not have a common factor other than 1	Choose one:
A) Only 1 B) Only 2 C) Only 3 and 4 D) Only 1 and 4 E) 1, 2, 3 and 4
15,16 are not prime numbers, but GCD for them is 1. so statement one is incorrect.   2,7 have 1 as GCD, but they are not consecutive numbers.   Statement 3 and 4 are correct. Since GOnly 3 and 4D is 1, we can't have a common prime factor or a common factor other than 1 for the two numbers   ANSWER:Only 3 and 4
<result>C</result>
If GCD of two numbers (both integers, greater than 1) is 1, then which of the following must be true?
1. They are prime.
2. They are consecutive.
3. They do not have a common prime factor
4. They do not have a common factor other than 1