6 and 12, among many others.
That happens when one of the numbers is a factor of the other.
A prime number
One is.
Any pair of prime numbers
Even numbers.
The least common factor of any set of numbers is 1.
Yes, a pair of numbers can have fewer than two common factors. This only happens when the numbers are co-prime -- that is, when the numbers have only one common factor. In that case, the common factor is always 1.
1
yes
The least common factor of any set of numbers is 1.
Only if the magnitudes of two numbers are the same.
The pair of numbers that have a greatest common factor of 2 are any two even numbers. This is because the greatest common factor of two numbers is the largest number that divides both numbers evenly. Since 2 is the only even prime number, any two even numbers will have 2 as a common factor.