Pair of socks
Suppose there are pairs of blue socks all alike, and pairs of black socks all alike, scrambled in a drawer. How many socks must be drawn out, all at once (without looking at the drawer), to be certain of getting a matching pair?
The answer is 3.
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1 solution
At most 3 socks must be drawn out. Because if only 2 socks, sometimes it is not a pair.