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[" a,"b" ,"c" are sides of a triangle,an...

[" a,"b" ,"c" are sides of a triangle,and are in G.P.If log a "-log2b" ,log "2b-log3c" and log "3c" - loga "],[" are in A.P.,then "],[[" (A) angle A must be obtuse "," (B) angle "B" must be obtuse "],[" (C) "C=90^(@)," (D) none of these "]]

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