Q: WHAT ARE THE COMMON PRIME FACTOR IN THIS PAIR OF NUMBERS 21 AND 411?

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The common prime factors of 18 and 30 are 2 and 3.

The greatest common factor of 54 and 99 is 9, which is not prime. The greatest common factor of 80 and 114 is 2, which is prime.

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.

24 and 49 are relatively prime. Their only common factor is 1. All the other pairs have more than the number 1 as a common factor.

Okay. Give us a pair of numbers.

Related questions

A prime number

Any pair of prime numbers

relatively prime or co-prime.

The common prime factors of 18 and 30 are 2 and 3.

' 1 ' is their only common factor. They're both prime numbers.

The greatest common factor of 54 and 99 is 9, which is not prime. The greatest common factor of 80 and 114 is 2, which is prime.

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.

Any pair of prime or relatively prime numbers.

Numbers that are relatively prime, like 5 and 7 or 5 and 8.

Prime numbers have one factor pair.

56 and 105

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.