Question

5. Which two numbers are said to be relatively prime or co-prime? Find the GCF of the following numbers
and tell whether they are co-primes or not.
(a) 60, 75
(b) 52, 81
(c) 48, 72
(d) 28,45​

Answer 1

Answer:

If 1 is the GCF of any two numbers, then those numbers are said to be Co-prime/ relatively prime/mutually prime.

a) No

b) yes

c) no

d) yes

Step-by-step explanation:

a) Factors of 60 : 1, 2, 3, 4, 5, ......15,......

Factors of 75 : 1, 3, 5, .15,...

GCF = 15

No, these are not Co-primes

b) GCF of 52 and 81 is 1

yes , these are Co-primes

c) GCF of 48 and 72 is 24

no, these are not Co-primes

d) GCF of 28 and 45 is 1

yes, these are Co-primes