Discussion
A man wears socks of two colours - Black and brown. He has altogether 20 black socks and 20 brown socks in a drawer. Supposing he has to take out the socks in the dark, how many must he take out to be sure that he has a matching pair ?
Answer: A
Correct answer: 3
There are only two colours, so among any three socks two must match - the pigeonhole principle. Two is not enough, since they could be one of each. The count of 20 in each colour is irrelevant to the answer, and it is put there to tempt the solver towards 20 or 21.
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