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[" 48.If "a=1+log(xx)b=1+log(y)2x" and "...

[" 48.If "a=1+log_(xx)b=1+log_(y)2x" and "c=1+log_(z)xy" then "ab+bc+ca" is "],[[" (A) "1," (B) "0],[" (C) "abc]]

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