The resistance values in the section of the circuit shown in the figure are R1=1 Ohm, R2=2 Ohm, R3=3 Ohm, R4=4 Ohm. Between points A, B, C, D, it is necessary to connect an additional resistance r = R2 so that the total resistance of the circuit section is: a) the minimum possible; b) the maximum possible. What pairs of points are these for cases a) and b)? What will be the total resistance of the section in cases a) and b)?
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