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# No chordates are tracheophytes, and all members of Pteropsida are trac

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No chordates are tracheophytes, and all members of Pteropsida are trac  [#permalink]

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Updated on: 23 Jul 2018, 04:19
3
13
00:00

Difficulty:

45% (medium)

Question Stats:

62% (01:36) correct 38% (01:54) wrong based on 756 sessions

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No chordates are tracheophytes, and all members of Pteropsida are tracheophytes. So no members of Pteropsida belong to the family Hominidae.

The conclusion above follows logically if which one of the following is assumed?

(a) All members of the family Hominidae are tracheophytes
(b) All members of the family Hominidae are chordates
(c) All tracheophytes are members of Pteropsida
(d) No members of the family Hominidae are chordates
(e) No chordates are members of Pteropsida

Originally posted by u0422811 on 01 Apr 2012, 21:16.
Last edited by Bunuel on 23 Jul 2018, 04:19, edited 2 times in total.
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Re: No chordates are tracheophytes, and all members of Pteropsida are trac  [#permalink]

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24 Aug 2012, 12:22
3
3
Its a 30 second question if you use Venn diagrams.

Draw two circles touching each other but they shouldn't overlap. Label one as C and the other as T. In T, draw a smaller circle and label it as P.
now the conclusion states that no member of P belongs to H.
This can only be possible in two ways. If H lies outside of both the bigger circles,C and T, or H lies inside C.
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Re: No chordates are tracheophytes, and all members of Pteropsida are trac  [#permalink]

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01 Apr 2012, 21:34
since no C is T,
means H has to be a part of C so that P does not belong to H.

its clear from B.
Hence B. You can draw Venn diagrams for such questions.
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Re: No chordates are tracheophytes, and all members of Pteropsida are trac  [#permalink]

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01 Apr 2012, 23:08
1
1
u0422811 wrote:
No chordates are tracheophytes, and all members of Pteropsida are tracheophytes. So no members of Pteropsida belong to the family Hominidae.

The conclusion above follows logically if which one of the following is assumed?

(a) All members of the family Hominidae are tracheophytes
(b) All members of the family Hominidae are chordates
(c) All tracheophytes are members of Pteropsida
(d) No members of the family Hominidae are chordates
(e) No chordates are members of Pteropsida

OKAY LOGIC IN THE ARGUMENT:

~C--> T
P--> T

Conclusion: ~P--> H

THE MISSING LINK IS EITHER BETWEEN H and T or H and C.

(a) All members of the family Hominidae are tracheophytes--> THIS IS JUST OPPOSITE OF WHAT WE WANT
(b) All members of the family Hominidae are chordates--> CORRECT
(c) All tracheophytes are members of Pteropsida--> OUT OF SCOPE
(d) No members of the family Hominidae are chordates--> OPPOSITE OF WHAT WE WANT
(e) No chordates are members of Pteropsida--> OUT OF SCOPE

HENCE B is correct.

Hope this helps..!!!
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Re: No chordates are tracheophytes, and all members of Pteropsida are trac  [#permalink]

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23 Dec 2013, 20:24
Why e is wrong?

CH NOT TR
PT=TR
conclusion PT NOT HO
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Re: No chordates are tracheophytes, and all members of Pteropsida are trac  [#permalink]

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24 Dec 2013, 00:34
2
2
email2vm wrote:
Why e is wrong?

CH NOT TR
PT=TR
conclusion PT NOT HO

Hello email2vm

ANALYZE THE STIMULUS:

Name:
C = chordates
T = tracheophytes
P = Pteropsida
H = Hominidae.

Argument says:
(1) C # T (No C = T)
(2) P = T (All P = T)
(3) Thus: P # H (No P = H)

If H = C --> P # H. Because If H = C --> H # T (according fact 1), but we also have P = T --> P # H (conclusion)

(a) All members of the family Hominidae are tracheophytes
Wrong. H = T --> P = H. Hence, wrong.

(b) All members of the family Hominidae are chordates
Correct. H = C --> H # T, but P = T --> H # P. Correct.

(c) All tracheophytes are members of Pteropsida
Wrong. T = P. This is fact #2. Clearly, it is an assumption.

(d) No members of the family Hominidae are chordates
Wrong. What if H # C, but H = T? --> P = H --> Clearly the conclusion P # H is wrong.

(e) No chordates are members of Pteropsida
Wrong. C # P. This is a combination of fact #1 and fact #2. The combination is still a FACT. It is not a hidden statement which is defined as an assumption by GMAT standards.

Hope it helps.
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Re: No chordates are tracheophytes, and all members of Pteropsida are trac  [#permalink]

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25 Dec 2013, 01:21
(e) No chordates are members of Pteropsida
Wrong. C # P. This is a combination of fact #1 and fact #2. The combination is still a FACT. It is not a hidden statement which is defined as an assumption by GMAT standards.

It absolutely makes sense:
1> The premise (assumption) should not be stated fact in the question
2> It should hold true
3> pass negation test
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Re: No chordates are tracheophytes, and all members of Pteropsida are trac  [#permalink]

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16 Jul 2014, 08:44
Can u explain why option A is wrong? Even with that we can get the conclusion. I used tick and cross method. I believe both options A and B are good enough for right answers. Please explain me where I am going wrong. Thanks in advance.
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Re: No chordates are tracheophytes, and all members of Pteropsida are trac  [#permalink]

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24 Oct 2016, 22:52
u0422811 wrote:
No chordates are tracheophytes, and all members of Pteropsida are tracheophytes. So no members of Pteropsida belong to the family Hominidae.

The conclusion above follows logically if which one of the following is assumed?

(a) All members of the family Hominidae are tracheophytes
(b) All members of the family Hominidae are chordates
(c) All tracheophytes are members of Pteropsida
(d) No members of the family Hominidae are chordates
(e) No chordates are members of Pteropsida

---------------
I will give the OA once some people spell out their logic. Thanks.

Good question
To solve this question we use some numbers

ALL= 100
No= 0
Conclusion: 0P ---> H
Premise: 0C---->T and 100P----> T

(a) IncorrectAll members of the family Hominidae are tracheophytes
100H----> T the nthere is a possibility that few P belong to H.
(b) CorrectAll members of the family Hominidae are chordates
100H-----> C. and 0C ----->T and 100P----> T so there is no chance of overlap
(c) All tracheophytes are members of Pteropsida
(d) No members of the family Hominidae are chordates
(e) No chordates are members of Pteropsida
Similarly we can check for option C, D, and E

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Re: No chordates are tracheophytes, and all members of Pteropsida are trac  [#permalink]

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06 Jul 2018, 19:09
Hi abhimahna,

I think this question stem should be : which of the following CAN be an assumption.

Because
The family of H can lie outside both C and T
OR
The family of H can lie inside C
OR
The family of C can lie inside H.

Thank you
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Re: No chordates are tracheophytes, and all members of Pteropsida are trac  [#permalink]

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23 Jul 2018, 04:16
u0422811 wrote:
No chordates are tracheophytes, and all members of Pteropsida are tracheophytes. So no members of Pteropsida belong to the family Hominidae.

The conclusion above follows logically if which one of the following is assumed?

(a) All members of the family Hominidae are tracheophytes
(b) All members of the family Hominidae are chordates
(c) All tracheophytes are members of Pteropsida
(d) No members of the family Hominidae are chordates
(e) No chordates are members of Pteropsida

+1 : B

If H = C, then P can't be equal to H as per premise.
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Re: No chordates are tracheophytes, and all members of Pteropsida are trac &nbs [#permalink] 23 Jul 2018, 04:16
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