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 ?

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Question: 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 ?
[A].

3

[B].

20

[C].

39

[D].

None of these

Answer: Option A

Explanation:

Since there are socks of only two colours, so two out of any three socks must always be of the same colour.