Question

which of the following is a pair of coprime a)55,57 b)46,50 c)72,78 d)none​

Answer 1

Answer:

A 55,57

Step-by-step explanation:

Because there are no common factors except 1 in that pair.

Answer 2

Answer:

55 and 57 is a pair of co-prime numbers

Step-by-step explanation:

Co prime numbers mean that the two numbers given have no HCF rather than 1.

The numbers in Options (b) and (c) are even so they will go by 2 (they cannot be the answer because only 1 should be common).

However, in Option (a), the numbers are co-prime. Their factorisation are-

55= 5 x 11

57= 3 x 19

As you can see, only 1 is common.

Therefore, your answer is Option (a).

Hope this helps...