Question 1030568
You want to be " guaranteed " a match. In
other words - 100% of the time, you get a match.
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If you take out 2 socks are you guaranteed a match?
No -you could have BW or WB
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If you take out 3 socks are you guaranteed a match?
Yes -you could have:
WBW, BBW 
WWB, BWB
WBB, BBB
WWW, BWW
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I think that's all of them -notice you always get 
at least 1 match -no way to avoid it.