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Since 1, known as the "multiplicative identity", cannot be counted as a factor, there are many pairs of numbers that do not have common factors, such as 2 and 3, 2 and 5, and 3 and 5. There are many pairs of composite (not prime) numbers without common factors, such as 4 and 9.
Also, since prime numbers do not have factors, any pair of primes cannot have a common factor, though a pair in which one number is prime may, e.g. 5 and 10.
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What is the least common factor of 14 and 21?
The least common factor of any set of numbers is 1.
Why do you have greatest common factor and not least common factor?
The least (meaning lowest) common factor of any set of whole numbers is always 1. The greatest common factor of any set of whole numbers will depend on the factors of the individual whole numbers in the set.
What pair Of numbers have a greatest common factor of 2?
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.
What are the lowest common factor of 6 and 8?
The least common factor of any set of numbers is 1.
What is the least common factor of 13 and 19?
The least common factor of any set of numbers is 1.
