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I am trying but could not find any way of calculating the equivalent resistance of this circuit. Please help me. Should I use the Wheatstone Bridge equivalent resistance, the Y-$\Delta$ transform, or a more general method?

Circuit diagram

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This is solved using start-delta transformation and Delta-Star transformation like shown in the below picture enter image description here

when you rewrite the circuit diagram it looks like this and you can notice delta network and star network in it. enter image description here

Applying proper transformation reduces the complex network to simple network, then you can solve simple series/parallel combination network to get effective resistance between the node A and B.

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