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[" If "a=1+log(x)yz,b=1+log(y)zx" and "c...

[" If "a=1+log_(x)yz,b=1+log_(y)zx" and "c=1+log_(z)xy," then "ab+bc+ca" is: "],[[" A) "1," B) "0," C) "abc," D) "z]]

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