A drawer in the dark holds 10 blue socks and 10 red socks.
How many do you need to grab to be SURE of a matching pair?

3.. Two socks could split colours. The third one has nowhere to hide — it must match one of the first two. The pigeon-hole strikes again.

Question

Accepted Answer

3. — Two socks could split colours. The third one has nowhere to hide — it must match one of the first two. The pigeon-hole strikes again.