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 ?
Select
A) 3 B) 20 C) 39 D) 45 E) None of these
Explanation:   Since there are socks of only two colours, so two out of any three socks must always be of the same colour.   3nswer: 3
<result>A</result>
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 ?