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In the circuit shown in the figure all t...

In the circuit shown in the figure all the resistances are identical and each has the value `r Omega`. The equivalent resistance of the combination between the points A and B will remain unchanged even when the following pairs of points marked in the figure are connected through a resistance R.

A

2 and 6

B

3 and 6

C

4 and 7

D

4 and 6

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