I no longer wish you in that wonderful little prison you constructed, pdurrant.
I better have this one right, as everyone seems to think it was so easy...
Spoiler:
I stuck my hand in and grabbed a Black sock.
(So, as I'm usually late, and it always takes the longest possible time for me when I'm late..
)
2nd time- Blue or Brown
3rd time - Blue or Brown (which ever I didn't get the 2nd time)
4th time- Eureka! It doesn't matter which color I get, it has to match one of the other 3 I already have , but only "given that I was unlucky in the socks I pulled out" previously.
answer: 4