Question need help . thanks.

BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

This topic has expert replies

Post new topic Post Reply

Previous Topic Next Topic

silvia928: Senior | Next Rank: 100 Posts; Posts: 37; Joined: Sat May 24, 2008 8:59 pm

Question need help . thanks.

by silvia928 » Fri May 30, 2008 10:34 am

K is a set of integers sunch 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.

ANS. (A)

I dont quite understand why knowing 50 is in K will help????

Quote

Source: Beat The GMAT — Data Sufficiency | Fri May 30, 2008 10:34 am

aatech: Master | Next Rank: 500 Posts; Posts: 192; Joined: Tue Apr 29, 2008 7:41 am; Thanked: 14 times

by aatech » Fri May 30, 2008 10:47 am

NS A

Stmt 1 - 50 is in the set K. So, as per the question, 51 will be in the same set.. Similarly 52 will be in the set. So on and So forth so 100 will be in the set.. SUFF

Stmt 2 - 150 is in the set K. It might be possible that 150 is the first element of the set so 100 cannot be in the set.. or it might be possible that the set is like 100, 101, .... 150.. So, 100 can or cannot be in the set. NOT SUFF