The effective resistance between $A$ and $B$, if resistance of each resistor is $R$, will be
A $\frac{2}{3} \mathrm{R}$
B$\frac{8 R}{3}$
C$\frac{5 R}{3}$
D$\frac{4 R}{3}$
JEE MAIN 2024, Diffcult
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B$\frac{8 R}{3}$
b From symmetry we can remove two middle resistance.
New circuit is
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