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

A (21, 35) 
B (23, 92) 
C (18, 25) 
D (16, 62) 

+ Answer
C 

+ Explanation
solution:
H.C.F.of 18 and 25 is 1. So, they are co-primes.

+ Report

Md. Habib Ullah

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