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# Most serious students are happy students, and most serious

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Manager
Joined: 29 Jul 2009
Posts: 176
Most serious students are happy students, and most serious [#permalink]

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06 Aug 2009, 17:50
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Question Stats:

74% (01:45) correct 26% (01:20) wrong based on 89 sessions

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Most serious students are happy students, and most serious students go to graduate school. Furthermore, all students who go to graduate school are overworked.

Which one of the following can be properly inferred from the statements above?

1) Most overworked students are happy students.
2) Some happy students are overworked
3) All overworked students are serious students
4) Some unhappy students go to graduate school
5) All serious students are overworked
[Reveal] Spoiler: OA
Senior Manager
Joined: 11 Dec 2008
Posts: 478
Location: United States
GMAT 1: 760 Q49 V44
GPA: 3.9
Re: Most serious students are happy students, and most serious [#permalink]

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06 Aug 2009, 18:42
this is formal logic and isn't tested on the GMAT, only on the lsat, so unless you are interested for your curiosity's sake I wouldn't worry about it
Director
Joined: 05 Jun 2009
Posts: 818
WE 1: 7years (Financial Services - Consultant, BA)
Re: Most serious students are happy students, and most serious [#permalink]

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06 Aug 2009, 20:36
B it is.
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Senior Manager
Joined: 26 May 2009
Posts: 305
Re: Most serious students are happy students, and most serious [#permalink]

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09 Aug 2009, 06:04
B
Manager
Joined: 05 Jul 2009
Posts: 181
Re: Most serious students are happy students, and most serious [#permalink]

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10 Aug 2009, 02:09
bipolarbear wrote:
this is formal logic and isn't tested on the GMAT, only on the lsat, so unless you are interested for your curiosity's sake I wouldn't worry about it

Just out of curiosity, what is a formal logic?

Btw, IMO the answer is B.
Senior Manager
Joined: 17 Jul 2009
Posts: 286
Concentration: Nonprofit, Strategy
GPA: 3.42
WE: Engineering (Computer Hardware)
Re: Most serious students are happy students, and most serious [#permalink]

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10 Aug 2009, 18:21
B...kind of question like IF A then B, then if NOT B then NOT A? questions like these i think...logic stuff...
Intern
Joined: 29 Jun 2009
Posts: 15
Location: Dallas TX
Re: Most serious students are happy students, and most serious [#permalink]

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11 Aug 2009, 06:55
B

In questions like these, it is preferred to look at the words like - some, may be, etc
Errors will contain words like - only, all,
Manager
Joined: 15 Jan 2008
Posts: 55
Re: Most serious students are happy students, and most serious [#permalink]

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11 Aug 2009, 07:22
Awesome question.

Someone can explain more clearly?
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Intern
Joined: 14 Jan 2013
Posts: 5
Re: Most serious students are happy students, and most serious [#permalink]

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19 Jun 2014, 18:26
This was my line of thinking as I wrote this out, also yes I am reviving a 5 year old thread .

S = Serious Students
H = Happy
G = Serious Students who Go to Graduate School
O = Over worked

Most S = H
Most S = G
H = G
Most serious students who are happy = Most Serious Students who go to graduate school

All G = O, and this can also be assumed as "some" serious students who go to graduate school, since an alternative to "ALL" could be "some."

If that is the case then can you not also assume that "some" serious students who are happy = some serious students who go to graduate school?

So in this case "some G" = "some" students who are overworked, and "some" G = "some" students who are happy, as indicated above.

B) Some happy students are overworked
Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
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Location: Pune, India
Re: Most serious students are happy students, and most serious [#permalink]

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19 Jun 2014, 22:18
Most serious students are happy students, and most serious students go to graduate school. Furthermore, all students who go to graduate school are overworked.

Which one of the following can be properly inferred from the statements above?

1) Most overworked students are happy students.
2) Some happy students are overworked
3) All overworked students are serious students
4) Some unhappy students go to graduate school
5) All serious students are overworked

thanks for explaining

You can make Venn diagrams to understand the given data.
Attachment:

Ques3.jpg [ 31.82 KiB | Viewed 2518 times ]

Most serious students are happy students, - More than 50% of serious students are happy so the red and yellow circle overlap such that more than 50% of the red circle is covered by the yellow circle.

and most serious students go to graduate school - More than 50% of serious students are go to graduate schools so the red and green circle overlap such that more than 50% of the red circle is covered by the green circle.

This implies that the yellow and the green circle will definitely have some overlap.

Furthermore, all students who go to graduate school are overworked. - The white circle envelopes the green circle completely.

Since yellow (happy students) circle does overlap with green circle (go to graduate school) and green circle is inside the white (overworked) circle,. it means the yellow circle and white circle must overlap atleast a bit.

So some happy students are overworked.

None of the other options "must be true". They may or may not be true but we cannot properly infer them.
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Manager
Joined: 07 Jun 2015
Posts: 60
WE: Design (Aerospace and Defense)
Most serious students are happy students, and most serious [#permalink]

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25 Dec 2015, 22:44
I will disassemble the argument

1. Most serious-------->Happy

2. All students in grad school----> over worked

Few points before going to answer.
Two categories of students here. Most serious and other students.

a. We don’t know how much % does 'most serious' students occupy in the entire pool of students.
b. Other students can be happy
c. Other students go to school
d. Other students do over work
e. Most=above 50%
f. Some= An unknown quantity(less than 50% ?)

1) Most overworked students are happy students.- we can,t say that
2) Some happy students are overworked- yep an unknown quantity of happy students are
overworked. It can be 1% to 100%.
3) All overworked students are serious students – no only some over worked students are serious
4) Some unhappy students go to graduate school- All other students also can be happy.
5) All serious students are overworked---Unhappy students can be there in the pool who is
working hard

please do mention if i am wrong in my reasoning.

Last edited by pkm9995109794 on 26 Dec 2015, 01:54, edited 1 time in total.
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Joined: 02 Aug 2009
Posts: 4559
Re: Most serious students are happy students, and most serious [#permalink]

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26 Dec 2015, 00:17
Most serious students are happy students, and most serious students go to graduate school. Furthermore, all students who go to graduate school are overworked.

Which one of the following can be properly inferred from the statements above?

1) Most overworked students are happy students.
2) Some happy students are overworked
3) All overworked students are serious students
4) Some unhappy students go to graduate school
5) All serious students are overworked

There is a group of serious students..
given that:-
1)Most serious students are happy students... Most would mean >50%
2) most serious students go to graduate school...

since both the groups "happy students" and "students go to graduate school" have most of the serious students within its ambit..
there ha sto be atleast a few of both the groups overlapping,
that is some serious students have to be common to the two groups.."happy students" and "students go to graduate school" ...
whcih in turn means that some happy students go to graduate school
But we are also told that all th egraduate school students are overworked..
so some happy students go to graduate school can be written as some happy students are overworked students
B
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Re: Most serious students are happy students, and most serious   [#permalink] 26 Dec 2015, 00:17
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