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DS Yes or NO type Questions

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DS Yes or NO type Questions

by veenitj » Fri Apr 13, 2012 9:53 am
Hi All,

I am little confused with the Yes or No type questions in DS. If for e.g. statement A satisfies that the given condition is true => Yes, and the statement B also satisfies the gievn condition but is false => No. So what should be the answer should it be D.

For e.g.

Is 4+n/6 an integer ?

(1) n is multiple of 6
(2) n divided by 6 remainder is 1

here with (1) we get Yes, with (2) No. is the answer D or A.

Thanks in advance.
VJ
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by killer1387 » Fri Apr 13, 2012 10:15 am
whats the source of this question?
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by GmatKiss » Fri Apr 13, 2012 11:07 am
IMO: D
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by iwillsurvive101 » Fri Apr 13, 2012 6:06 pm
IMO, The two answer choices contradict each other

1) n is multiple of 6

=> n/6 is an integra
4(integra) + integer = integer

YES

2) n/6 = R1 => n is not divisible by 6 (if its divisible, remainder has to be 0)

NO

But 1) says n is divisible by 6, and 2 says n is not divisible by 6.

IMO, the correct answer choice is D, but, again, the two answer choices should not contradict each other.
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by Birottam Dutta » Fri Apr 13, 2012 8:55 pm
The two choices should ideally not contradict each other but there is a possibility that they may do so. In the event of the above happening, the choice shall be D or Both statements are sufficient for answering the question.

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by Brent@GMATPrepNow » Sat Apr 14, 2012 6:23 am
The two statements in a DS question can never contradict each other.
As such, the original question could never be an official GMAT question.

Here's a YouTube video I created that addresses how we can use this fact (that DS statements cannot contradict each other) to help us spot problems with our calculations: https://youtu.be/vkK9IHSV8yA

Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
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by veenitj » Tue Apr 17, 2012 10:09 am
This questiond is from kaplan GMAT prep book. Thanks everyone for the input. I will remember that both statments should not contradict each other.


Cheers

VJ
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