Combination of Resistors
The equivalent resistance between A and B is:

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Answer: (c)
- A goes to the , B to the . The vertical middle wire makes the top-middle and bottom-middle points one node X; the horizontal middle wire (it jumps over the vertical one) makes the two side midpoints one node Y.
- Between X and Y: , and , all in parallel .
- . So the answer is (c) .