A) \[\frac{x+y}{xy}\]
B) \[\frac{xy}{x+y}\]
C) \[xy\]
D) \[\frac{x}{y}\]
Correct Answer: B
Solution :
| From equation, (1) and (2), we get |
| \[a+b=\frac{zd}{x}+\frac{zd}{y}=zd\left( \frac{1}{x}+\frac{1}{y} \right)\] |
| \[\Rightarrow \,\,\,\,\,\,\,\,z=zd\left( \frac{y+x}{xy} \right)\] \[[z=a+b]\] |
| \[\Rightarrow \,\,\,\,\,\,\,\,d=\frac{xy}{x+y}\] |
| So, option [b] is correct. |
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