in Combinatory
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1 vote
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You have a box containing 10 black and 10 blue socks.What is the minimum number of times you need to pull out so that you have a pair of the same color?
in Combinatory
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1 Answer

5 votes
5 votes
we have to see the worst case what can happen
In first draw suppose we pulled black sock and in second draw we pulled blue sock , so we have to do one more draw as in third draw we can pull either black or blue and whatever we will draw a matching pair is guaranteed
so 3 pull required at minimum

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Got it thanks
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