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## Homework Statement

I solved my original question so I posted another one.

http://i.imgur.com/dpevY.png

Find [itex]R_{eq}[/itex] at terminals (c,d)

## Homework Equations

[itex]R_{eq}[/itex] in series = Ʃ R

[itex]R_{eq}[/itex] in parallel = [itex]\frac{1}{R_{1}}[/itex] + [itex]\frac{1}{R_{2}}[/itex] + ...+ [itex]\frac{1}{R_{n}}[/itex]

## The Attempt at a Solution

I don't think any of the resistors are in series or parallel.

For the equivalent resistor at terminals (a,b) the book says that it's 9Ω. I'm not sure how to get that answer.

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