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another DS ques

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another DS ques

by vivek.kapoor83 » Thu Oct 09, 2008 9:38 am
Q - If K is a set of integers, such tha if t r is in K , then r+1 would also be in K. Is 100 in K ?


1. 50 is in K
2.150 is in K.
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by vivek.kapoor83 » Thu Oct 09, 2008 10:24 am
can any1 provide the solution ?
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by mental » Thu Oct 09, 2008 10:25 am
what is OA? A?
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by vivek.kapoor83 » Thu Oct 09, 2008 10:34 am
Pls explain it
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by mental » Thu Oct 09, 2008 10:42 am
i am not very sure of this

if 50 is in k, then 50+1 will be in k
now if 51 is in k, then 51+1 will be in k, nd so on
so 100 will be in k

if 150 is in k, we dont know where k starts from, it can from 0, 50, 99, 120,150 or any number less than 150, insufficient

so what is OA?
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by Gmatss » Thu Oct 09, 2008 10:45 am
mental..
but can we assume that set continues upto 100?
the ques just states k is set of integers...
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by vivek.kapoor83 » Thu Oct 09, 2008 10:49 am
that is the prob. we dont know from where K Starts. OA is A> but reasoning wht mental has given is very wierd but i thnk this could be the only reason.
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by mental » Thu Oct 09, 2008 10:52 am
that was the reason, i was not sure of my answer

what is the source?
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by Ian Stewart » Thu Oct 09, 2008 12:11 pm
mental wrote:i am not very sure of this

if 50 is in k, then 50+1 will be in k
now if 51 is in k, then 51+1 will be in k, nd so on
so 100 will be in k

if 150 is in k, we dont know where k starts from, it can from 0, 50, 99, 120,150 or any number less than 150, insufficient

so what is OA?
Yes, your reasoning here is perfect, and a clear explanation as well.
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by mental » Fri Oct 10, 2008 6:37 am
thanks Ian for clearing the doubt
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by kris610 » Fri Oct 10, 2008 7:20 am
Yeah, it is A.

Vivek, you may wanna post DS questions in the 'Data Sufficiency' section.
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