The only common factor is one.
11 and 19 are prime numbers so only common factor is 1.
That depends what numbers. If you mean ALL even and odd numbers, the only common factor or divisor is 1.
There is no such thing as the common factor of a single number. Only two or more numbers can have a common factor. This is like asking what is common between me and myself. Everything. But you could ask what is common between you and your sister.
The ONLY common factor of 25 & 27 is... 1
They are called prime numbers.
All numbers have a common factor of 1. Sometimes that's the only common factor.
They are relatively prime, like 4 and 9.
The only common factor of these numbers is 1.
The factors of three are both odd numbers.
It has none - you can only have a common factor between two or more numbers.
Their only common factor is 1.
The only factor they have in common is 1.
Yes. Not counting one as a factor, you could have numbers like 6 and 10 which only share one common factor, 2.
The least common factor of any set of numbers is 1.
6 is a factor of 36 but a common factor is only applicable to two or more numbers.
The numbers are co-prime so the only common factor is 1.