question_answer

If\[\frac{1}{x}+\frac{1}{y}=\frac{1}{2z}\] then z is equal to

A)  \[\frac{x+y}{2xy}\]                        

B)  \[\frac{xy}{2(x+y)}\]  

C)  \[\frac{xy}{(x+y)}\]       

D)         \[\frac{x+y}{xy}\]