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No senator spoke at the convention unless he or she was a

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No senator spoke at the convention unless he or she was a [#permalink]

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New post 16 Mar 2011, 23:11
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60% (01:31) correct 40% (01:40) wrong based on 368 sessions

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No senator spoke at the convention unless he or she was a Democrat. No Democrat both spoke at the convention and was a senator.
Which one of the following conclusions can be correctly drawn from the statements above?

(A) No one but senators spoke at the convention.
(B) No Democrat spoke at the convention.
(C) Only Democrats spoke at the convention.
(D) No senator spoke at the convention.
(E) Some Democrat senators spoke at the convention.

I will post OA later.
[Reveal] Spoiler: OA

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Re: Democrats and Senators [#permalink]

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New post 16 Mar 2011, 23:25
Got B

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Re: Democrats and Senators [#permalink]

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New post 17 Mar 2011, 00:29
I think the answer is D. Why I think B is wrong is that there may be democrats who spoke but were not senators.

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Re: Democrats and Senators [#permalink]

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New post 17 Mar 2011, 00:57
Yeah that's reasonable d makes sense

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Re: Democrats and Senators [#permalink]

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New post 17 Mar 2011, 10:37
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IMO D

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Re: Democrats and Senators [#permalink]

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New post 17 Mar 2011, 12:19
IEsailor wrote:
IMO D



OA is D
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Re: Democrats and Senators [#permalink]

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New post 10 May 2012, 08:07
vivesomnium wrote:
I think the answer is D. Why I think B is wrong is that there may be democrats who spoke but were not senators.


because there is a chance that someone who is democrat and not a senator spoke. Saying the scope of "no democrat" is too wide.

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Re: No senator spoke at the convention unless he or she was a [#permalink]

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New post 04 Jul 2013, 00:15
Can someone help advise if there is any diagram or logical steps which should be followed in order to end up with D? I'm not good at such kind of question. Many thanks then.

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Re: No senator spoke at the convention unless he or she was a [#permalink]

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kimberly87 wrote:
Can someone help advise if there is any diagram or logical steps which should be followed in order to end up with D? I'm not good at such kind of question. Many thanks then.


hi,
thats true these types are mindbreaking.
lets try

there are two types of senator:
senators who spoke in convention (SWS)and
senators who donot(SWD)

Similarly two types of democrats:
democrats who spoke(DWS)
democrats who donot(DWD)

now lets tackle the argument:
No senator spoke at the convention unless he or she was a Democrat. ==>means Senators who spoke ,they were democrats==>SWS=D.....(1)
No Democrat both spoke at the convention and was a senator.==>means if a person is speaking in convention and he is a SENATOR...then that person is not a DEMOCRAT
===>SWS is not equal to D......(2)
If both 1 and 2 are to be true.....it means....NO senator spoke....then only the 2 equation will hold true.
and option D says the same.

hope it helps
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Re: No senator spoke at the convention unless he or she was a [#permalink]

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New post 08 Jul 2013, 19:26
another new type of question, might just become staple in the new GMAT with a null set intersection in the arguments. ("Does not mean anything" for old mental fogies like me)

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Re: No senator spoke at the convention unless he or she was a [#permalink]

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New post 19 Nov 2013, 17:16
Why not it is c.
Only democrat spoke at the convention because if
senator not spoke - is no democrat
senator spoke - is democrat
so only democrat spoke at the convention is not rgt .
Please help.

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Re: No senator spoke at the convention unless he or she was a [#permalink]

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New post 20 Nov 2013, 00:12
taleesh wrote:
Why not it is c.
Only democrat spoke at the convention because if
senator not spoke - is no democrat
senator spoke - is democrat
so only democrat spoke at the convention is not rgt .
Please help.


Hi taleesh.

I'm glad to help.

There are TWO statements:
(1) Senators who spoke MUST be Democrat.
(2) No Democrat both spoke and was senator.


Two statements must work together.

You're correct for statement 1: Only democrat senator spoke at the convention because if he/she is not democrat, he/she will not speak.

But you omitted the second statement: No democrat both spoke and was senator
==> NO senator who was democrat spoke ==> No democrat senator spoke.
==> Add statement (1): only democrat senator spoke at the convention
==> Clearly, no senator spoke.

Hope it helps.
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Re: No senator spoke at the convention unless he or she was a [#permalink]

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New post 20 Dec 2015, 06:12
PTK wrote:
No senator spoke at the convention unless he or she was a Democrat. No Democrat both spoke at the convention and was a senator.
Which one of the following conclusions can be correctly drawn from the statements above?

(A) No one but senators spoke at the convention.
(B) No Democrat spoke at the convention.
(C) Only Democrats spoke at the convention.
(D) No senator spoke at the convention.
(E) Some Democrat senators spoke at the convention.

I will post OA later.

Good question.
I draw the following inferences. 1) If one speaks - he or she is not a senator. 2) If one doesn't speak - he or she a senator
Now look at options
A) Out. You can't speak and be a senator
B) Out. One can speak and be a democrat (if you are not a democrat you can't speak)
C) We don't know who else spoke on the convention
D)Yes right. If you speak you are not a senator (both conditions are not possible)
E) Again out. Senators can't speak. If you are a senator then you don't speak
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Re: No senator spoke at the convention unless he or she was a [#permalink]

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New post 14 Oct 2017, 04:24
PTK wrote:
No senator spoke at the convention unless he or she was a Democrat. No Democrat both spoke at the convention and was a senator.
Which one of the following conclusions can be correctly drawn from the statements above?

(A) No one but senators spoke at the convention. Actually it is the opposite +- and -+ ---> false
(B) No Democrat spoke at the convention. We have ++ in one cell ---> false
(C) Only Democrats spoke at the convention - we have ++ in non democrate-njn senator cell ---> false.
(D) No senator spoke at the convention. +- and -+ ---> True
(E) Some Democrat senators spoke at the convention. +- in this cell ---> fals

I will post OA later.


1st row - 1st condition
2nd row - 2nd condition
The cell with + and + - these people are the ones who can speak at the convention.
Any - means, this person can not speak at the convention.
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Re: No senator spoke at the convention unless he or she was a [#permalink]

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New post 14 Oct 2017, 04:47
PTK wrote:
No senator spoke at the convention unless he or she was a Democrat. No Democrat both spoke at the convention and was a senator.
Which one of the following conclusions can be correctly drawn from the statements above?

(A) No one but senators spoke at the convention.
(B) No Democrat spoke at the convention.
(C) Only Democrats spoke at the convention.
(D) No senator spoke at the convention.
(E) Some Democrat senators spoke at the convention.

I will post OA later.


I will just try to simplify the language in order to reach to the answer in a simpler way. [My easier-to-understand statement modification might have some ingrained logical loopholes, however, they make it easier to reach to the correct answer choice.

No senator spoke at the convention unless he or she was a Democrat - Only Democrats/Republicans-who-weren't-senators spoke at the convention.
No Democrat both spoke at the convention and was a senator. - No Democrat Senator spoke at the convention.

If we check both the simplified statements above, it is clear that no senator spoke at the convention.
Therefore, D.

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Re: No senator spoke at the convention unless he or she was a   [#permalink] 14 Oct 2017, 04:47
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