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Q.

A man wears socks of two colors – Black and brown. He has altogether 20 black socks and 20 brown socks in a drawer. Supposing he has to take out of the socks in the dark, how many must he take out to be sure that he has a matching pair?


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a

3

b

20

c

39

d

None of these 

answer is A.

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Detailed Solution

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