If x, y, z are positive then minimum value of xlogy−logz+ylogz−logx+zlogx−logy is
3
1
9
16
A
9
B
3
C
1
D
16
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Solution
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Let a=xlogy−logz,b=ylogz−logx,c=zlogx−logy Now, log(abc)=loga+logb+logc ⇒log(abc)=(logy−logz)logx+(logz−logx)logy+(logx−logy)logz=0 ⇒abc=1
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