co-ordinate geometry .

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Md.Nazrul Islam: Senior | Next Rank: 100 Posts; Posts: 32; Joined: Sat Jul 16, 2011 11:31 am

by Md.Nazrul Islam » Sun Apr 01, 2012 6:23 pm

L1,L2,and L3 are lines in a plane .is L1 perpendicular to L3 .

1) L1 is perpendicular to L2.

2) L2 is perpendicular to L3.

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Source: Beat The GMAT — Data Sufficiency | Sun Apr 01, 2012 6:23 pm

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Anurag@Gurome: GMAT Instructor; Posts: 3835; Joined: Fri Apr 02, 2010 10:00 pmFollowed by: 523 members; Location: Milpitas, CA; Thanked: 1854 times; GMAT Score:770

by Anurag@Gurome » Sun Apr 01, 2012 6:38 pm

Md.Nazrul Islam wrote:L1,L2,and L3 are lines in a plane .is L1 perpendicular to L3 .

1) L1 is perpendicular to L2.

2) L2 is perpendicular to L3.

(1) L1 is perpendicular to L2.

The figure clearly shows that L1 may or may not be perpendicular to L3; NOT sufficient.

(2) L2 is perpendicular to L3.

The figure clearly shows that L1 may or may not be perpendicular to L3; NOT sufficient.

Combining (1) and (2), L1 is perpendicular to L2 and L2 is perpendicular to L3.

So, combining we can answer the question; SUFFICIENT.

The correct answer is C.

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