Calculation: bXLuRj - 1

 
 1
/ R
  = 
 
 1
/ R1
+ 
 1
/ R2
 
 1
/ R
 =  
 1
/ R1
+ 
 1
/ R2
$$\frac{1}{R}$$ = $$\frac{1}{R1}+\frac{1}{R2}$$
R =  
 1
/ ( 
 1
/ R1
+ 
 1
/ R2
)
$$R$$ = $$\frac{1}{\frac{1}{R1}+\frac{1}{R2}}$$
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