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

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

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New post 18 Jul 2009, 04:01
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A
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C
D
E

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7. 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.

OA is C but I am not sure why. Can anyone explain ?

Thanks,

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Re: 1000 CR  [#permalink]

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New post 18 Jul 2009, 09:38
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if X, then y

==> If not Y, then not X.
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Re: 1000 CR  [#permalink]

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New post 18 Jul 2009, 13:12
i agree with the reasoning given by sudeep,

if x then y, if not y then not x,

for ex: if 70, means you crossed 60, if not 60, then you also didn't cross 70....i hope this relates to what sudeep is trying to say...?
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Re: 1000 CR  [#permalink]

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New post 19 Jul 2009, 02:27
mokri wrote:
i agree with the reasoning given by sudeep,

if x then y, if not y then not x,

for ex: if 70, means you crossed 60, if not 60, then you also didn't cross 70....i hope this relates to what sudeep is trying to say...?



Thanks Guys .. !
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Re: 1000 CR  [#permalink]

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New post Updated on: 11 Aug 2009, 11:22
1
mokri wrote:
i agree with the reasoning given by sudeep,

if x then y, if not y then not x,

for ex: if 70, means you crossed 60, if not 60, then you also didn't cross 70....i hope this relates to what sudeep is trying to say...?


if 70, means you crossed 60, if not 60, then you also didn't cross 70
if 70, means you crossed 60, if not crossed 60, then it's not 70.

But in general it is considered in terms of events.

If x event happen, then Y happens.

So if there is no event Y, then it is clearly understood that X event didn't happen.
This is because, Y is like a child event of X, and Y will always be there with X.

But ==> If Y happened, it doesn't imply that X has happened. Because it is nowhere mentioned that Y happens only when X happens.
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Originally posted by sudeep on 19 Jul 2009, 12:31.
Last edited by sudeep on 11 Aug 2009, 11:22, edited 1 time in total.
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Re: 1000 CR  [#permalink]

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New post 19 Jul 2009, 21:54
sudeep wrote:
mokri wrote:
i agree with the reasoning given by sudeep,

if x then y, if not y then not x,

for ex: if 70, means you crossed 60, if not 60, then you also didn't cross 70....i hope this relates to what sudeep is trying to say...?


if 70, means you crossed 60, if not 60, then you also didn't cross 70
if 70, means you crossed 60, if not crossed 60, then it's not 70.

But in general it is considered in terms of events.

If x event happen, then Y happens.

So if there is no event Y, then it is clearly understood that X event didn't happen.
This is because, Y is like a child event of X, and Y will always be there with X.

But ==> If Y happened, it doesn't imply that X has happened. Because it is nowhere mentioned that Y happens only when X happens.



Thanks alot Sudeep , I understood the concept.. ! :)
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Re: 1000 CR  [#permalink]

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New post 21 Jul 2009, 02:49
Well explained sudeep +1

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Re: 1000 CR &nbs [#permalink] 21 Jul 2009, 02:49
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