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DS question

by magical cook » Tue Sep 25, 2007 5:37 pm
K is a set of integers such that if the integer r is in K, then r + 1 is also in K. Is 100 in K?

(1) 50 is in K.
(2) 150 is in K.


Can anyone help pls...?
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Source: — Data Sufficiency |
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by kajcha » Tue Sep 25, 2007 6:38 pm
IMO A

Q says that is r is in set K then r+1 will be in K

Stmt 1 - 50 is in K. Then 51 will be in K. 52 will be in K. So on and so forth... 100 will be in K too

Stmt 2 - 150 is in K. The Q does not say if r is in K, r-1 is in K or not.
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by samirpandeyit62 » Tue Sep 25, 2007 11:24 pm
I agree with Kajcha ans should be A

Stmt 1 - same as Kajcha explained

Stmt 2 - 150 is in K then 151 must be in K ... hence 100 is not in K, this is possible if 150 is the first integer in the set or basically the set begins from 101.

wheras if the set starts from an integer less than 150 and 100 then 100 will also be there in the set & so will be 150

hence not SUFF
Last edited by samirpandeyit62 on Wed Sep 26, 2007 7:19 am, edited 1 time in total.
Regards
Samir
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by kajcha » Wed Sep 26, 2007 5:42 am
Thanks samir, stmt 2 is better explained that way...
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by magical cook » Wed Sep 26, 2007 7:38 am
Thank you both for explanation- and you're right the answer is A.
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