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