Question

(a) 63, 65 18) Which of the following is not a pair of co-primes? Choose the correct answer: (a) 20, 25 (b) 57, 59 (C) 59, 61 (d) 67, 69​

Answer 1

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In number theory, Co-prime numbers are those numbers if the only positive factor that divides them is 1.

Here,

Option A: (17,15) Factor that divides both of them is 1.

Option B: (10,16) Factors that divides both oh them are 1,2.

Option C: (20,24) Factors that divide both of them are 1,2,4.

Option C: (31,62) Factors that divide both oh them are 1,31.

In reference to above definition (17,15) are co-prime numbers.

Hence Option A is correct.

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Answer 2

Step-by-step explanation:

Option A: (17,15) Factor that divides both of them is 1.

Option B: (10,16) Factors that divides both oh them are 1,2.

Option C: (20,24) Factors that divide both of them are 1,2,4.

Option C: (31,62) Factors that divide both oh them are 1,31.

In reference to above definition (17,15) are co-prime numbers.