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There are 30 pens with six colors and the number of each..

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maverickjin8
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There are 30 pens with six colors and the number of each.. [#permalink] New post   27 Dec 2015, 05:38
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I'am struggling with this probability problem.

There are 30 pen with six colors and the number of each color pen is same. What is the least number of pens selected, surely 5 same color pens are selected
The answer is : 25

Apart from solving the question, I don't exactly understand the meaning of the question.
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sandy
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Re: There are 30 pens with six colors and the number of each.. [#permalink] New post   04 Jan 2016, 08:52
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maverickjin8 wrote:
I'am struggling with this probability problem.

There are 30 pen with six colors and the number of each color pen is same. What is the least number of pens selected, surely 5 same color pens are selected
The answer is : 25

Apart from solving the question, I don't exactly understand the meaning of the question.



Here we 30 pens and 6 colors. Hence there are 5 pens per color. Now the worst case scenario is we pick 4 pens from each color ie 24 pens and still not have 5 pens of a single color.

Hence the number of pens to be selected for 5 pens of one color is 24+1 = 25.
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Re: There are 30 pens with six colors and the number of each.. [#permalink]
04 Jan 2016, 08:52
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