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# If A, then B. If B, then C. If C, then D. If all of the

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VP
Joined: 18 May 2008
Posts: 1200
If A, then B. If B, then C. If C, then D. If all of the [#permalink]

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11 Oct 2008, 17:56
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If A, then B.
If B, then C.
If C, then D.
If all of the statements above are true, which of the following must also be true?
(A) If D, then A.
(B) If not B, then not C.
(C) If not D, then not A.
(D) If D, then E.
(E) If not A, then not D.

What is the the strategy to solve these types of CR problems?

--== Message from GMAT Club Team ==--

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VP
Joined: 17 Jun 2008
Posts: 1322

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11 Oct 2008, 20:05
ritula wrote:
If A, then B.
If B, then C.
If C, then D.
If all of the statements above are true, which of the following must also be true?
(A) If D, then A.
(B) If not B, then not C.
(C) If not D, then not A.
(D) If D, then E.
(E) If not A, then not D.

What is the the strategy to solve these types of CR problems?

these are cause effect questions we need to target the must be situations !!!where 100% surety is there !!!

C is the answer !!!we know if A happens D must happen hence we can say when D does not happen A has not happened !!

also
A)->D can be caused by others too ,one particular cause is A,Eliminate
B)Same as above B is just one cause of C what if something else causes C
C)PERFECT ,A-> D when D does not occur no A
D)Whats E now?
E)same as A,B OUT

ANY EFFECT WHICH EXISTS DUE TO A CAUSE SHOWS THAT IF ITS ABSENT THE CORRESPONDING CAUSE IS ALSO ABSENT but not vice versa since THE EFFECT CAN HAVE MULTIPLE CAUSES.

HTH
_________________

cheers
Its Now Or Never

Director
Joined: 23 May 2008
Posts: 756

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11 Oct 2008, 20:12
ritula wrote:
If A, then B.
If B, then C.
If C, then D.
If all of the statements above are true, which of the following must also be true?
(A) If D, then A.
(B) If not B, then not C.
(C) If not D, then not A.
(D) If D, then E.
(E) If not A, then not D.

What is the the strategy to solve these types of CR problems?

I have seen these types of CR on the LSAT, but not the GMAT. Does the gmat test on these type of questions?
VP
Joined: 18 May 2008
Posts: 1200

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11 Oct 2008, 20:48
I came thru this question on one of GMAT practice test only.
bigtreezl wrote:
ritula wrote:
If A, then B.
If B, then C.
If C, then D.
If all of the statements above are true, which of the following must also be true?
(A) If D, then A.
(B) If not B, then not C.
(C) If not D, then not A.
(D) If D, then E.
(E) If not A, then not D.

What is the the strategy to solve these types of CR problems?

I have seen these types of CR on the LSAT, but not the GMAT. Does the gmat test on these type of questions?
Director
Joined: 23 May 2008
Posts: 756

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11 Oct 2008, 21:16
ritula wrote:
I came thru this question on one of GMAT practice test only.
bigtreezl wrote:
ritula wrote:
If A, then B.
If B, then C.
If C, then D.
If all of the statements above are true, which of the following must also be true?
(A) If D, then A.
(B) If not B, then not C.
(C) If not D, then not A.
(D) If D, then E.
(E) If not A, then not D.

Time to dust off the old LSAT logical reasoning techniques
What is the the strategy to solve these types of CR problems?

I have seen these types of CR on the LSAT, but not the GMAT. Does the gmat test on these type of questions?
Senior Manager
Joined: 02 Dec 2007
Posts: 432

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12 Oct 2008, 14:46
Look for words such as : - almost, some , most, virtually all etc.
Senior Manager
Joined: 21 Apr 2008
Posts: 265
Location: Motortown

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12 Oct 2008, 15:13
1
KUDOS
If A, Then B

A implies B True
B Implies A False (converse)
not A implies not B False (Inverse)
not B implies not A True (Contra positive)

(A) If D, then A. Converse - Ruled out
(B) If not B, then not C. Inverse - Ruled out
(C) If not D, then not A. Contrapositive - Answer
(D) If D, then E. ????
(E) If not A, then not D Inverse - Ruled out

Retired Moderator
Joined: 05 Jul 2006
Posts: 1741

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13 Oct 2008, 06:57
[quote="ritula"]If A, then B.
If B, then C.
If C, then D.
If all of the statements above are true, which of the following must also be true?
(A) If D, then A.
(B) If not B, then not C.
(C) If not D, then not A.
(D) If D, then E.
(E) If not A, then not D.

TRANSLATE

IF Europians then blonds

If blonds then beautifull

if beautifull then green eyes

D
VP
Joined: 30 Jun 2008
Posts: 1018

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13 Oct 2008, 18:56
LiveStronger wrote:
If A, Then B

A implies B True
B Implies A False (converse)
not A implies not B False (Inverse)
not B implies not A True (Contra positive)

(A) If D, then A. Converse - Ruled out
(B) If not B, then not C. Inverse - Ruled out
(C) If not D, then not A. Contrapositive - Answer
(D) If D, then E. ????
(E) If not A, then not D Inverse - Ruled out

Thank you +1

BTW, Is this question from an official source? I hope GMAC is not out to test LSAT type questions on us....

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

_________________

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Re: CR   [#permalink] 13 Oct 2008, 18:56
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# If A, then B. If B, then C. If C, then D. If all of the

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