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

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SVP
Joined: 03 Feb 2003
Posts: 1604
There are three black and two white balls in a closed box. [#permalink]

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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?
Senior Manager
Joined: 22 Aug 2003
Posts: 257
Location: Bangalore

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26 Sep 2003, 04:37
4 is my answer (to be certain that atleast one is white)
26 Sep 2003, 04:37
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