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Mammu wears socks of two different colours—white and brown. She keeps them all in the same drawer in a state of complete disorder. She has altogether 20 white socks and 20 brown socks in the drawer. Supposing she has to take out the socks in the dark, how many must she take out of the drawer to be sure that she has a matching pair?


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She will have to take out three socks to have a matching pair
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