a) Find the equivalent resistance Rab in the circuit in Fig. 1 by using a ∆-to-Y transform...

a) Find the equivalent resistance Rab in the circuit in Fig. 1 by using a ∆-to-Y transformation involving the resistors R2, R3, and R4.

b) Repeat (a) using a Y-to-∆ transformation involving resistors R2, R4. and R5.

c) Give two additional ∆-to-Y or Y-to-∆ transformations that could be used to find Rab.

Figure 1