First of all I am Sorry for posting answer so late. I have been under Doctor's Knife.
Question - https://steemit.com/mathematics/@crazybutterfly/mind-teaser-1
Solution:
ZERO
I had 3 Blue socks and 1 Pink sock.
=> chances of pair of Blue socks = 1/2
chances of pair of Mixed socks = 1/2
chances of pair of Pink socks = ZERO