Find the resistance of the circuit shown in Fig. 228 if r1 = r2 = 1.8 Ohm, r3 = 1.0 Ohm, r4 = 3 Ohm, r5 = 1.0 Ohm, r6 = 1.2 Ohm, r7 = 0.8 Ohm, r8 = 1.2 Ohm, r9 = r10 = 3 Ohm, r11 = r12 = 0.3 Ohm, r13 = 0.7 Ohm.

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