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Source: — Data Sufficiency |

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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.

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

(2) L2 is perpendicular to L3.

Image

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.

Image


So, combining we can answer the question; SUFFICIENT.

The correct answer is C.
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