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# This CR is not for those who just say "I'll pick A". The

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Director
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This CR is not for those who just say "I'll pick A". The [#permalink]

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14 Nov 2006, 01:04
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This CR is not for those who just say "I'll pick A". The best person for this one would have been Haas_MBA but that guy scored 750 and bailed out little too early - too bad !

Some of the worldâ€™s most beautiful cats are Persian cats. However, it must be acknowledged that all Persian cats are pompous, and pompous cats are invariably irritating.
If the statements above are true, each of the following must also be true on the basis of them EXCEPT:
(A) Some of the worldâ€™s most beautiful cats are irritating.
(B) Some irritating cats are among the worldâ€™s most beautiful cats.
(C) Any cat that is not irritating is not a Persian cat.
(D) Some pompous cats are among the worldâ€™s most beautiful cats.
(E) Some irritating and beautiful cats are not Persian cats.

Can someone draw Euler diagram or Venn diagram and explain this to me. Please attach the diagram or post it as an image.
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14 Nov 2006, 01:54
here's my attempt...

A) True
B) True
C) False --> Can be some other pompus cats
D) True
E) True

I'll take C.
Attachments

venn_cat.doc [20.5 KiB]

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14 Nov 2006, 02:13
Ohk lemme try my hand at this oneâ€¦â€¦â€¦

The three main statements are
1. Some of the worlds most beautiful cats are persian cats

2. All persian cats are pompous.

3. All pompous cats are irritating(I assumed this bcoz the statement says that pompous cats are invariably irritating)

2+3 gives us statement 4

4. All persian cats are irritating (the diagram will tell u as to how we got statement 4)

Choice A ,B,C and D are clearly ruled out, coz they all stand true from the diagram we drawn and from the statemnets we've arrived at.

Choice E is obviously the wrong answer as we cannot support it(coz we havent been given any statements about some............not)

Also, as a general rule, All and some can never result in some....not. This i've made a posting about in Honghu's sticky about logical CR's
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14 Nov 2006, 02:28
Ohk lemme try my hand at this oneâ€¦â€¦â€¦

The three main statements are
1. Some of the worlds most beautiful cats are persian cats

2. All persian cats are pompous.

3. All pompous cats are irritating(I assumed this bcoz the statement says that pompous cats are invariably irritating)

2+3 gives us statement 4

4. All persian cats are irritating (the diagram will tell u as to how we got statement 4)

Choice A ,B,C and D are clearly ruled out, coz they all stand true from the diagram we've drawn and from the statemnets we've arrived at.

Choice E is obviously the wrong answer as we cannot support it(coz we havent been given any statements about some............not)

Also, as a general rule, All and some can never result in some....not. This i've made a posting about in Honghu's sticky about logical CR's
Attachments

gmat.doc [1.51 MiB]

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14 Nov 2006, 03:20
C 2
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14 Nov 2006, 07:43
OA Plz?
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14 Nov 2006, 11:19
All of the choices seem true to me. At least choices A thru D are definitely TRUE. For E - some irritating and beautiful cats are not Persian and yet some of them are.

What's the OA?

I am barely two weeks away from the exam and these types of questions are doing a world of good to my morale!
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14 Nov 2006, 15:29
dwivedys wrote:
All of the choices seem true to me. At least choices A thru D are definitely TRUE. For E - some irritating and beautiful cats are not Persian and yet some of them are.

What's the OA?

I am barely two weeks away from the exam and these types of questions are doing a world of good to my morale!

These are exactly the kind of questions that u must think of as experimental, take a wild guess and move on!

I pick C!
Whats the OA, Swagatalaksmi?
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14 Nov 2006, 17:05
I think we even don't need to draw a ven diagram. E is striaght answer. Read the underlined parts in argument and answer choice E below...they seems similar but are not exactly same.

I would have choosen E based on this.

-------------------
Some of the worldâ€™s most beautiful cats are Persian cats. However, it must be acknowledged that all Persian cats are pompous, and pompous cats are invariably irritating.
If the statements above are true, each of the following must also be true on the basis of them EXCEPT:
(A) Some of the worldâ€™s most beautiful cats are irritating.
(B) Some irritating cats are among the worldâ€™s most beautiful cats.
(C) Any cat that is not irritating is not a Persian cat.
(D) Some pompous cats are among the worldâ€™s most beautiful cats.
(E) Some irritating and beautiful cats are not Persian cats.

-------------------------------------
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14 Nov 2006, 19:41
arjsingh1976 wrote:
I think we even don't need to draw a ven diagram. E is striaght answer. Read the underlined parts in argument and answer choice E below...they seems similar but are not exactly same.

I would have choosen E based on this.

-------------------
Some of the worldâ€™s most beautiful cats are Persian cats. However, it must be acknowledged that all Persian cats are pompous, and pompous cats are invariably irritating.
If the statements above are true, each of the following must also be true on the basis of them EXCEPT:
(A) Some of the worldâ€™s most beautiful cats are irritating.
(B) Some irritating cats are among the worldâ€™s most beautiful cats.
(C) Any cat that is not irritating is not a Persian cat.
(D) Some pompous cats are among the worldâ€™s most beautiful cats.
(E) Some irritating and beautiful cats are not Persian cats.

-------------------------------------

I would go with C. We can solve this without using Venn diagram also. But I prefer using Venn diagram to solve problems like this.
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14 Nov 2006, 20:03
arjsingh1976 wrote:
I think we even don't need to draw a ven diagram. E is striaght answer. Read the underlined parts in argument and answer choice E below...they seems similar but are not exactly same.

I would have choosen E based on this.

-------------------
Some of the worldâ€™s most beautiful cats are Persian cats. However, it must be acknowledged that all Persian cats are pompous, and pompous cats are invariably irritating.
If the statements above are true, each of the following must also be true on the basis of them EXCEPT:
(A) Some of the worldâ€™s most beautiful cats are irritating.
(B) Some irritating cats are among the worldâ€™s most beautiful cats.
(C) Any cat that is not irritating is not a Persian cat.
(D) Some pompous cats are among the worldâ€™s most beautiful cats.
(E) Some irritating and beautiful cats are not Persian cats.

-------------------------------------

How about a little logic ? Considering "beautiful cats" a different set, why statement has to be flase ?

Thanks Ywilfred, jyotsnasarabu for your sincere try. Here is what I got.
Please tell me where I'm wrong.
Attachments

Cats_Venn.JPG [ 50.15 KiB | Viewed 609 times ]

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15 Nov 2006, 00:20
I would still stand by E. Since, there is no mention about beautiful cats at all in the question.................hence, E cannot be justified and the statement is false........................
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15 Nov 2006, 02:04
Give me E.
The question states:
If the statements above are true, each of the following must also be true on the basis of them EXCEPT

We are basically looking for something that could be true but need not be true given the stated information.

I guess all of us eliminated A, B and D straight away. C and E however are a little more difficult!

If persian cat (A), then pompus (B).
If pompus (B), then irritating (C).
In effect: If persian cat (A), then irritating (C).
This is equivalent to:
If not irritating (NOT C), then not persian cat (NOT A).
(Refer Hong-hu's CR notes for this)

C says: Any cat that is not irritating is not a Persian cat.
This must be true. SO OUT

E it is.
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15 Nov 2006, 03:17
Kripal - I agree that by your logic - E must be it. However the question asks us to find out which of the choice is NOT true. If a choice is both true and not true I guess we can't really assume it is NOT true and move on.

I bet as Priyah mentioned - if this question appeared on actual GMAT, there are very high chances of it being experimental.

Ms. SwagatLakshmi, if you would reveal the source it would be great.
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15 Nov 2006, 03:57
Sticking with (C) here. How can we be sure that if a cat is not irritating that it must not be Persian. What if the Persian cat had just been fed?
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15 Nov 2006, 04:36
GMATT73 wrote:
Sticking with (C) here. How can we be sure that if a cat is not irritating that it must not be Persian. What if the Persian cat had just been fed?

IMO wondering about whether the cat was fed or not is a little outside the scope. You need to make an addded assumption that lack of food is a source of irritation. I think the question is quite straightforward....

'Each of the following MUST be true except' can also be read as 'Which of the following need not be true'.

The right answer may or may not be true but it is not ALWAYS true.
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15 Nov 2006, 08:14
kripalkavi wrote:
GMATT73 wrote:
Sticking with (C) here. How can we be sure that if a cat is not irritating that it must not be Persian. What if the Persian cat had just been fed?

IMO wondering about whether the cat was fed or not is a little outside the scope. You need to make an addded assumption that lack of food is a source of irritation. I think the question is quite straightforward....

'Each of the following MUST be true except' can also be read as 'Which of the following need not be true'.

The right answer may or may not be true but it is not ALWAYS true.

I was joking about the "just being fed" part. Sorry, guess my dry sense of humor isn't always transparent
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15 Nov 2006, 08:26
GMATT73 wrote:
kripalkavi wrote:
GMATT73 wrote:
Sticking with (C) here. How can we be sure that if a cat is not irritating that it must not be Persian. What if the Persian cat had just been fed?

IMO wondering about whether the cat was fed or not is a little outside the scope. You need to make an addded assumption that lack of food is a source of irritation. I think the question is quite straightforward....

'Each of the following MUST be true except' can also be read as 'Which of the following need not be true'.

The right answer may or may not be true but it is not ALWAYS true.

I was joking about the "just being fed" part. Sorry, guess my dry sense of humor isn't always transparent
'

Good one Matt )
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15 Nov 2006, 09:05
in <1 mn, it is clearly(at least I hope!) E.

It cannot be C, since C is 100% true:

Persian cats->pompous->irritating.

Negate the line above and reverse the arrows:
not irritating->not pompus->not persian.

E can be true as it can be false.
Since we are looking for something that must not be true, E it is.
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15 Nov 2006, 15:55
One more for C
15 Nov 2006, 15:55

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