The resistance between terminals a and b in the figure is 75 Ω. If the resistors labeled R have the 

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hello i know its an old video but can you tell me how to factor it and if its not factorable can you explain the other method. thank you

Hmm... I see the negative sign in -IR in Kirchhoff's Voltage Law. However, the current is flowing in the direction of the resistor. Why have a negative sign there?

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3:39 I saw that!

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