If x : y : : y : z, which of the statements is true?

1.	If x : y : : y : z, which of the statements is true?
A.	xy = yz
B.	xyz = x
C.	\[{{y}^{2}}\] = xz
D.	zy = x
Answer» D. zy = x

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If x : y : : y : z, which of the statements is true?

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