solve this

 

 

    If log a, log b ,log c are in AP and also log a-log 2b ,log2b-log3c , log3c-loga are in AP then

 

abc are in ap

a 2b 3c are in ap

abc are the sides of the triangle

none

 

 

 

 

          please give me the comp soln

 

 i will be grateful