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Find the equivalent resistance between A and B

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\frac{8R}{7}

\frac{7 R}{8}

\frac{8}{7 R}

\frac{7}{8 R}

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detailed solution

Correct option is A

Symmetry about XY, X and Y are same potential make new diagram by placing X and Y at one place

$R_{eq} = [\frac{(R+ \frac{R}{3}) R}{(R+ \frac{R}{3}) +R}] ×2= \frac{8R}{7}$

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