A) \[\frac{xy}{(x-y)}\]
B) \[x-y\]
C) \[\frac{xy}{(y-x)}\]
D) \[\frac{(x-y)}{(xy)}\]
Correct Answer: C
Solution :
\[\frac{1}{x}=\frac{1}{y}+\frac{1}{z}\] or \[\frac{1}{z}=\frac{1}{x}-\frac{1}{y}=\frac{y-x}{xy}\] or \[z=\frac{xy}{(y-x)}\]
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