148 Is a + b <= 1

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ern5231: Master | Next Rank: 500 Posts; Posts: 226; Joined: Sun Aug 09, 2009 4:34 am

by ern5231 » Thu May 13, 2010 9:09 am

Is a + b <= 1?
(1) a ^ 2 + b ^ 2 <= 1
(2) a ^ 2-b ^ 2 <= 1

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Source: Beat The GMAT — Data Sufficiency | Thu May 13, 2010 9:09 am

pradeepkaushal9518: Legendary Member; Posts: 1309; Joined: Wed Mar 17, 2010 11:41 pmFollowed by: 5 members; Thanked: 33 times

by pradeepkaushal9518 » Thu May 13, 2010 10:04 am

1. a^2+b^2<=1 doesnt implies that a+b<=1 not sufficient hence A n D out

2.a^2-b^2<=1

(a+b)(a-b)<=1

it doesnt mean (a+b)<=1

imo E what is oa

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analyst218: Master | Next Rank: 500 Posts; Posts: 140; Joined: Fri Feb 05, 2010 2:43 pm; Thanked: 3 times; GMAT Score:720

by analyst218 » Thu May 13, 2010 1:41 pm

ern5231 wrote:Is a + b <= 1?
(1) a ^ 2 + b ^ 2 <= 1
(2) a ^ 2-b ^ 2 <= 1

+1 for E

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