Question

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Answer 1

Step-by-step explanation:

1) 18 and 35

here, the factors of 18 are 1, 2, 3, 9 and 18.

and, the factors of 35 are 1, 5, 7 and 35.

so, 18 and 35 both have only one common factor are 1 and HCF of each number is also 1.

so, both are co-prime numbers.

2) 15 and 37

here, the factors of 15 are 1, 3, 5 and 15.

and, the factors of 37 are 1 and 37.

so, 15 and 37 both have only one common factor is 1 and HCF of each number is also 1.

so, both are co-prime numbers.

3) 30 and 415

here, the factors of 30 are 1, 2, 3, 5, 10 and 30.

and, the factors of 415 are 1, 5, 83 and 415.

so, 30 and 415 both common factors are 1 and 5 and HCF of each number is

5. Because they have not 1 only common factor.

so, both are not co-prime numbers.

4) 17 and 65

here, the factors of 17 are 1 and 17.

and, the factors of 65 are 1, 5, 13 and 65.

so, 17 and 65 both have only one common factor is 1 and HCF of each number is also 1.

so, both are co-prime numbers.

5) 216 and 215

here, the factors of 216 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 27, 36, 54, 72, 108 and 216.

and, the factors of 215 are 1, 5, 43 and 215.

so, 216 and 215 both have only one common factor is 1 and HCF of each number is also 1.

so, both are co-prime numbers.

6) 81 and 16

here, the factors of 81 are 1, 3, 9, 27 and 81.

and, the factors of 16 are 1, 2, 4, 8 and 16.

so, 81 and 16 both have only one common factor is 1 and HCF of each number is also 1.

so, both are co-prime numbers.

now, 1, 2, 4, 5 and 6 are co-prime numbers.

hope it help.

Answer 2

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