11 If log7 x + log13 x = 1 and x = 13logh? then ) is divisible by (A) 7 (B) 13 (C) 17 (D) 119

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( log _{7} x+log _{13} x=1 ) ( x=139 x^{7}=7^{log _{12} 13} ) ( log _{7} x+lg _{13} 13 x^{7}=1 ) ( -1 log _{7} 7^{log _{13} 13}+log _{13} 15^{log _{13} 7}=1 ) ( =log _{k} 13+log _{k} 7=1 ) ( -lg _{k}(3 x+)=lg _{16} k ) ( k=13 times 7 ) is dumuli ( (A)^{frac{K u}{d(B)}} )

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