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Question
 What is the total resistance of a circuit when R1 (7 k omega.gif) is in series with a parallel combination of R2 (20 k omega.gif), R3 (36 k omega.gif), and R4 (45 k omega.gif)?
Options:
A .  4 k omega.gif
B .  17 k omega.gif
C .  41 k omega.gif
D .  108 k omega.gif
Answer: Option B

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