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Calculate the total resistance of a circuit containing three resistors wired in parallel when R1 =...

Calculate the total resistance of a circuit containing three resistors wired in parallel when R1 = 100 , R2 = 200 O, and R3= 50 O

Consider that you slightly alter the previous circuit so that R1 and R2 are still in parallel, but R3 is now in series with the pervious two. What is the total resistance of this circuit?  

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