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# The school bus always stops at the railroad tracks. When the

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The school bus always stops at the railroad tracks. When the [#permalink]

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10 May 2010, 07:03
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The school bus always stops at the railroad tracks. When the warning light is not flashing, it then proceeds directly across if the tracks are clear. However, when the warning light is not flashing and the tracks are not clear, the school bus waits until they are clear and then proceeds immediately across them.
if the statements above are true and it is true that the school bus stops at the tracks and then does not proceed to cross them, which of the following must also be true?
(A) the warning light is flashing and the tracks are clear.
(B) the warning light is flashing and the tracks are not clear.
(C) the warning light is not flashing and the tracks are not clear.
(D) the warning light is flashing, or the tracks are not clear, or both.
(E) the warning light is not flashing, or the tracks are not clear, or both.

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Re: CR - logical implication question [#permalink]

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10 May 2010, 08:26
Ans B
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Re: CR - logical implication question [#permalink]

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10 May 2010, 09:20
I think it is E, but correct answer according to the book says D.

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Re: CR - logical implication question [#permalink]

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11 May 2010, 03:09
midass wrote:
The school bus always stops at the railroad tracks. When the warning light is not flashing, it then proceeds directly across if the tracks are clear. However, when the warning light is not flashing and the tracks are not clear, the school bus waits until they are clear and then proceeds immediately across them.
if the statements above are true and it is true that the school bus stops at the tracks and then does not proceed to cross them, which of the following must also be true?
(A) the warning light is flashing and the tracks are clear.
(B) the warning light is flashing and the tracks are not clear.
(C) the warning light is not flashing and the tracks are not clear.
(D) the warning light is flashing, or the tracks are not clear, or both.
(E) the warning light is not flashing, or the tracks are not clear, or both.

I picked 'C' , later understood its 'D'. 'D' is more correct than other options. 'A' is straight out. In 'B' even if tracks are clear and warning light flashing the schools bus still will decide to wait, so 'b' is not true. in 'C' looks aftr only one scenario it is true but partially. 'D' holds true for all possiblity. the bus will wait if warning lights are flashing or if not flashing but tracks are not clear or both happens. In 'E' if the warning light is flashing the bus will decide to wait doesnt matter if tracks are clear or not, again 'e' is partially true

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Re: CR - logical implication question [#permalink]

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11 May 2010, 10:49
i willl pick B ...but tough one what is the source

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Re: CR - logical implication question [#permalink]

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11 May 2010, 10:59
Confusing one.. however i picked D as this is the only option which is 'completely' correct. Other are either incorrect from teh stimulus or partially correct (E).

Source Please.

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Re: CR - logical implication question [#permalink]

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11 May 2010, 22:18
It is from the course material by Jamboree.

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Re: CR - logical implication question [#permalink]

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12 May 2010, 10:01
nilesh376 wrote:
midass wrote:
The school bus always stops at the railroad tracks. When the warning light is not flashing, it then proceeds directly across if the tracks are clear. However, when the warning light is not flashing and the tracks are not clear, the school bus waits until they are clear and then proceeds immediately across them.
if the statements above are true and it is true that the school bus stops at the tracks and then does not proceed to cross them, which of the following must also be true?
(A) the warning light is flashing and the tracks are clear.
(B) the warning light is flashing and the tracks are not clear.
(C) the warning light is not flashing and the tracks are not clear.
(D) the warning light is flashing, or the tracks are not clear, or both.
(E) the warning light is not flashing, or the tracks are not clear, or both.

I picked 'C' , later understood its 'D'. 'D' is more correct than other options. 'A' is straight out. In 'B' even if tracks are clear and warning light flashing the schools bus still will decide to wait, so 'b' is not true. in 'C' looks aftr only one scenario it is true but partially. 'D' holds true for all possiblity. the bus will wait if warning lights are flashing or if not flashing but tracks are not clear or both happens. In 'E' if the warning light is flashing the bus will decide to wait doesnt matter if tracks are clear or not, again 'e' is partially true

I picked B as the answer because, we can infer from the Q that the bus only passes if the tracks are clear.

D dosent make sense as it says the bus will stop if the lights are flashing, but that is not stated.
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Re: CR - logical implication question [#permalink]

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12 May 2010, 11:25
The question does not give any clue about what the train does when the warning light is flashing. Is it ok to assume?

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Re: CR - logical implication question [#permalink]

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14 May 2010, 04:32
IMO it's D

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Re: CR - logical implication question [#permalink]

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14 May 2010, 12:33
It's D you dummies =)

If the train stops it means
1) warning light is on (yes, if light is not on it goes thru, when it's on it stops)
2) Tracks are not clear (if not clear, train stops)

Both statements are true independently. Answer choices that use "AND" try to confuse you..they are saying that both conditions must be true in order for the train to stop. Instead, "OR" should be used because only one of those statements by itself can lead to conclusion that the train stops. Either 1 by itself, 2 by itself, and both by itself (which implies 1 and 2 at the same time) will lead to the train stopping.

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Re: CR - logical implication question [#permalink]

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14 May 2010, 15:18
IMO it should be D only

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Re: CR - logical implication question [#permalink]

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15 Jul 2010, 05:17
C?

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Re: CR - logical implication question [#permalink]

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15 Jul 2010, 06:07
D . the warning light is flashing, or the tracks are not clear, or both.

concidering School bus does not goes further if warning light is flashing.

Looks like question is little shady. Can some on fill in.
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Re: CR - logical implication question   [#permalink] 15 Jul 2010, 06:07
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# The school bus always stops at the railroad tracks. When the

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