Any consecutive even numbers.
That happens when one of the numbers is a factor of the other.
56 and 105
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.