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What is the smallest number of gloves you need to select to guarantee at least one matching pair?

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There are 40 gloves in a drawer: 10 pair of white gloves, 5 pairs of black gloves, 3 pairs of brown, and 2 pairs of gray. You select the gloves in the dark and can check them only after a selection has been made. What is the smallest number of gloves you need to select to guarantee at least one matching pair?

posted Aug 8, 2017 by Ramya

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A trip around the world!
Logic Level 3

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