In this task, you need to provide the correct option for a given problem on probability from the provided options.
Q: Problem: there are 5 pairs of socks and 2 socks are worn from that such that the pair of socks worn are not of the same pair . what is the number of pair that can be formed . 
Options: a ) 19 , b ) 20 , c ) 30 , d ) 32 , e ) 25
A: 
b