Which of the following pairs of numbers is co-prime?

Explanation

1. 01

   Co-prime means $\operatorname{HCF} = 1$.

2. 02

   91 and 143 share 13; 84 and 119 share 7; 65 and 117 share 13.

3. 03

   $77 = 7 \times 11$ and $136 = 2^3 \times 17$ share no prime, so they are co-prime.