petrifiedbutstanding wrote:

If 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

This may seem like an easy one! But I haven't been able to crack it!!

Explanation :

Just pictorial representation helps resolve the above equation

1: L1 P L2 ...

no mention of L3...hence NOT SUFFICIENT

hence A and D options are not the answers

2: L2 P L3

no mention of L1, hence NOT SUFFICIENT

Hence Option B Is not answer

so left with C & E

together L1 P L2 P L3

by this , we can see that L1 is parallel to L3...

hence L1 is not perpendicular to L3...

hence C is the answer
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Regards,

Harsha

Note: Give me kudos if my approach is right , else help me understand where i am missing.. I want to bell the GMAT Cat

Satyameva Jayate - Truth alone triumphs