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Calculate the equivalent resistance betw...

Calculate the equivalent resistance between the points `A and B` in the combination of resistors shown in (Fig. 3.56).
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Since `CD(= 20 Omega), DE (=10 Omega) and EF(= 20 Omega)` are in parallel combination, their effective resistance `(R_P) is 5 Omega`. Now `R_P and FB (=6 Omega)` are in series and as such resistance between `A and B = 5 Omega + 6 Omega = 11 Omega`.
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