If L1,L2,L3 are lines in a plane is L1 perpendicular to L3? 1) L1 is perpendicular to L2 . 2)L2 is perpendicular to L3.

L1 is parallel to L3; Both are required to answer. (that is C, right?)

Question asks for relation between L1 and L3. A) L3 not mentioned( Insufficient) B) L1 not mentioned( Insufficient) combine to find L1//L3 C.

bryan88 wrote:Question asks for relation between L1 and L3. A) L3 not mentioned( Insufficient) B) L1 not mentioned( Insufficient) combine to find L1//L3 C. Exactly. To answer, we need to know about the relationship between L1 and L3. Neither statement contains information about both lines, so we need to put them together to be able to answer.

Md.Nazrul Islam wrote:If L1,L2,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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