Which of the following is a pair of co-primes?
Question:

Which of the following is a pair of co-primes?
(a) (14, 35)
(b) (18, 25)
(c) (31, 93)
(d) (32, 62)

Solution:

The numbers that do not share any common factor other than 1 are called co-primes. 
Clearly in option (b), 
factors of 18 are: 1, 2, 3, 6, 9 and 18
factors of 25 are: 1, 5, 25
The two numbers do not share any common factor other than 1. 
They are co-primes to each other.

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