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by gmattester » Thu Aug 21, 2008 6:25 pm
In a sample of college students, 40 percent are thirdyear
students and 70 percent are not second-year
students. What fraction of those students who are not
third-year students are second-year students?
(A) 3/4
(B) 2/3
(C) 4/7
(D)1/2
(E) 3/7
Last edited by gmattester on Thu Aug 21, 2008 8:19 pm, edited 1 time in total.
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by dnairo1981 » Thu Aug 21, 2008 7:03 pm
is it D?
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by gmattester » Thu Aug 21, 2008 8:18 pm
Yes it is D.
Can you plz. explain this.
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by malolakrupa » Fri Aug 22, 2008 4:37 am
40 % are 3rd Year Students . Hence 60% are not 3rd year students - I

70% are not 2nd year students. Hence 30% are 2nd Year students - II

Now the problems asks for What fraction of students who are not
third-year students are second-year students?

Hence it is II / I = 60/30 = 1/2
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by gmattester » Fri Aug 22, 2008 6:00 am
malolakrupa wrote:40 % are 3rd Year Students . Hence 60% are not 3rd year students - I

70% are not 2nd year students. Hence 30% are 2nd Year students - II

Now the problems asks for What fraction of students who are not
third-year students are second-year students?

Hence it is II / I = 60/30 = 1/2
How you got 60/30=1/2.
60/30=2
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by sudhir3127 » Fri Aug 22, 2008 6:14 am
malolakrupa wrote:40 % are 3rd Year Students . Hence 60% are not 3rd year students - I

70% are not 2nd year students. Hence 30% are 2nd Year students - II

Now the problems asks for What fraction of students who are not
third-year students are second-year students?

Hence it is II / I = 60/30 = 1/2
i think its a typo by krupa!!!

its shud be

second year/ not third year

30/60 = 1/2

hope it clear ur doubt!!
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