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By the way, we have a typical pattern of GMAT DS trap (A,B vs C): the fist condition is complex and seems to be insufficient the second condition is very simple and insufficient. It would help to support fist condition.

By the way, we have a typical pattern of GMAT DS trap (A,B vs C): the fist condition is complex and seems to be insufficient the second condition is very simple and insufficient. It would help to support fist condition.

though OB is common and OL=OM why LB=LM is this another properties

if both <OLB=<OMB AND OL=OM therefore LB=LM

We have here two right triangles with the same hypotenuse and the same leg. So, we can express LB and MB as sqrt(OB^2-OL^2) and sqrt(OB^2-OM^2). As OL=OM --> LB=MB
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