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In a hostel, 60% of the students read Spanish news paper,

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In a hostel, 60% of the students read Spanish news paper, [#permalink] New post 21 Oct 2008, 11:54
In a hostel, 60% of the students read Spanish news paper, 40% read English news
paper and 20% read both Spanish and English news papers. A student is selected
at random. If she reads Spanish news paper, find the probability that she reads English
news paper.
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Re: probability [#permalink] New post 21 Oct 2008, 12:01
is it 1/4

plz post the choices when u post questions
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Re: probability [#permalink] New post 21 Oct 2008, 12:04
no, the answer is 1/3
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Re: probability [#permalink] New post 21 Oct 2008, 12:05
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earthwork wrote:
In a hostel, 60% of the students read Spanish news paper, 40% read English news
paper and 20% read both Spanish and English news papers. A student is selected
at random. If she reads Spanish news paper, find the probability that she reads English
news paper.



say total 100 students.

p = 20/60 = 1/3
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Re: probability [#permalink] New post 22 Oct 2008, 09:32
Yep! Fill the grid.

Find out S n E / S

20/60 = 1/3
Re: probability   [#permalink] 22 Oct 2008, 09:32
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In a hostel, 60% of the students read Spanish news paper,

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