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Question : 30 of 86

Marks: +1, -0

If

a^{x}=b^{y}=c^{z}

and

b^{2}=a c,

then

y

equals:

$\;{x y}/{x+z}$
$\;{z x}/{2(x-z)}$
$\;{z x}/{2(z-x)}$
$\;{2 x z}/{(x+z)}$

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