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[" If "log(2a)a=x,log(3a)2a=y," and "log...

[" If "log_(2a)a=x,log_(3a)2a=y," and "log_(4a)3a=z," then "xyz-2yz" is equal to "],[[" (1) "1," (2) "-1],[" (3) "-2," (2) "-1]]

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If x=log_(2a)a,y=log_(3a)2a and z=log_(4a)3a then prove that xyz+1=2yz

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If x=1+log_(a) bc, y=1+log_(b) ca, z=1+log_(c) ab , then (xyz)/(xy+yz+zx) is equal to