Question

Which of the following pairs of number are co-prime

1 point

5,15

7,21

9,23

11,121​

Answer 1

here 9,23 are co-prime

because their hcf is 1

other hcf ≠ 1

thanks

Answer 2

Answer:

9,23 is the co-prime

Step-by-step explanation:

A Co-prime number is a set of numbers or integers which have only 1 as their common factor i.e. their highest common factor (HCF) will be 1.

To find the answer, we have to Find the Factors of the numbers in a pair.

• 5 = 1, 5

• 15 = 1, 3, 5, 15

We have 5 HCF here, so it is not a Co-prime number.

• 7 = 1, 7

• 21 = 1, 3, 7, 21

We have 7 HCF here, so it is not a Co-prime number.

• 9 = 1, 3, 9

• 23 = 1, 23

We have 1 HCF here, so it is a Co-prime number.

• 11 = 1, 11
• 121 = 1, 11, 121

We have 11 HCF here so it is not a Co-prime number.

Hope it will help you,

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