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I really confused by this circuit: http://myspace.homelinux.com:32123/circuit.jpg [Broken]

When calculating the net resistance from A to C, how do I know if any current goes through 2 and 7? If there was current going through them, I have clue how they would contribute to the total circuit. For the second question, I don't even know where to start. Obviosly, the net resistance will be a little lower than just 1, but how the heck would you figure out the rest of it??

When calculating the net resistance from A to C, how do I know if any current goes through 2 and 7? If there was current going through them, I have clue how they would contribute to the total circuit. For the second question, I don't even know where to start. Obviosly, the net resistance will be a little lower than just 1, but how the heck would you figure out the rest of it??

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