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Q: Which two multiples of 13 are co-prime numbers?

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13

The numbers are coprime, so the answer is 1.

Since the numbers are coprime, the answer is 21*13 = 273.

101

The lowest common multiple of 9 and 13 is the product of the two numbers as they are coprime (they have no common factors). This results in a LCM of 117.

Multiples of 13.

Multiples of 13.

Multiples of 13

43

There is an infinite number of common multiples for 13 and 22. A common multiple of any two numbers is any number into which each of two or more numbers can be divided evenly (zero remainder).

There is an infinite number of common multiples for 13 and 18. A common multiple of any two numbers is any number into which each of two or more numbers can be divided evenly (zero remainder).

You need at least two numbers to find something in common between them.

There is an infinite number of common multiples for 13 and 25. A common multiple of any two or more numbers is any number into which each of two or more numbers can be divided evenly (zero remainder).

The GCF is 1.

No.

Select any two numbers that are coprime: that is they do not have any factor in common. For example, 7 and 13, or 14 and 39, or 8 and 27

The two numbers are coprime, so their greatest common factor is 1.

There is an infinite number of common multiples for 13 and 17. A common multiple of any two numbers is any number into which each of two or more number can be divided with zero remainder.

They are: 312 and its multiples

On some least common multiples, like this question here, there are no common multiples until you multiply the two numbers together, 40 x 13 = 520.

There is an infinite number of common multiples for 13 and 81. A common multiple of any two or more numbers is any number into which each of two or more numbers can be divided evenly (zero remainder). However, the least or lowest common multiple of 13 and 81 is 1,053.

Two multiples of any number greater than one can't be co-prime. They would always have that number as a common factor.

Since both 11 and 13 are prime numbers, the LCM of these 2 number is 11 * 13 = 143. All multiples of 143 are multiples of 11 and 13 as well

The least common multiple of 13 and 20 is 260.

390 and any of its multiples.