Question

13. What are co-primes? Give examples of five pairs of co-primes. Are co-primes always
primes? If no, illustrate your answer by an example.
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Answer 1

Answer:

two numbers are termed as co-prime whenever two number share no common factor.Two numbers are said to be co-prime if they have no common factor other than 1. (3, 5), (7, 9), (10, 13), (15, 16), (17, 19) are some pairs of co-prime numbers.

Answer 2

Step-by-step explanation:

Two numbers are said to be co-prime if they do not have a common factor other than 1.

2, 3; 3, 4; 4, 5; 5, 6; 6, 7 are the examples of five pairs of co-primes.

No. 15, 16 are co-prime but both of the numbers are not prime.

(or)

⇒ Two integers a and b are said to be relatively prime, mutually prime, or coprime (also written co-prime) if the only positive integer (factor) that divides both of them is 1. ... A set of integers can also be called coprime

⇒ Pairs of co-prime are: 2,3;3,4;4,5;5,6;6,7.

⇒ No, 15,16 are co-prime but none of them is prime.

hope this helps you and have a good day.