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If log(y)x=(a.log(z)y)=(b.log(x)z)=ab, t...

If `log_(y)x=(a.log_(z)y)=(b.log_(x)z)=ab`, then which of the following pairs of values for (a,b) is not possible?

A

`(1,1)`

B

`(2,2)`

C

`(-2,1//2)`

D

`(0.4,2.5)`

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