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Suppose there are 3 red balls, 4 blue balls, and 5 black balls. What?s the minimum number of balls you have to draw to ensure you have at least one ball in every color?



Answer :

[tex]10\ balls.\\\\Because:\\ The\ first\ five\ balls\ drawn\ can\ be\ black.\\The\ next\ four\ balls\ can\ be\ blue\ (5 +4 = 9).\\Ever y\ next\ ball\ is\ red. [/tex]

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