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If logy^(x)=(alog(z)y)=(blog(x)z=ab, the...

If `logy^(x)=(alog_(z)y)=(blog_(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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