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electricity always attempts the shorter path to it's final destination . since mountain and high hills are higher as compared to plains therefore it hits the high hills or mountains and even tall trees . 
  i hope it helps...........................^_^ 
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Hi there,
electricity is the flow of electrons .electrons have the tendency to take the shortest path to a certain distance.since the hilly areas are elevated as compared to the  ground.the lightning is most likely to strike hilly areas.
 i hope this helps u...