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There are three black and two white balls in a closed box.

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There are three black and two white balls in a closed box. [#permalink] New post 26 Sep 2003, 01:07
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There are three black and two white balls in a closed box. One takes several balls at random without repetitions. What should the minimal number of the taken balls be in order to be certain that at least one white ball is taken?
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 [#permalink] New post 26 Sep 2003, 04:37
4 is my answer (to be certain that atleast one is white)
  [#permalink] 26 Sep 2003, 04:37
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There are three black and two white balls in a closed box.

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