Find the resistance between terminals A and B of a ladder network. From A, a 10 Ω resistor leads to node 1. Node 1 has two paths to B: (i) a 25 Ω resistor in series with the parallel pair 60 Ω ∥ 20 Ω; (ii) a 24 Ω series resistor to node 2, where node 2 has a 20 Ω resistor to B and, in parallel with it, 50 Ω + 30 Ω in series to B. All connecting wires have zero resistance. (answer in Ω)