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Peter has many socks, all the same except that they are in nine different colours. 
He is leaving to catch an early train to go on a business trip, and he does not want to wake his wife, so he must pack in the dark. 
He needs six pairs of socks, each sock in each pair the same colour. 
How many socks must he take from his drawer to be sure of achieving this?

 Oct 27, 2019
 #1
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Peter must take at least 67 socks.

 Nov 26, 2019

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