Find req.. ..

Here as it is not given that between what points we need to find resistance. So i am considering it between point A and D
From the symmetry current in AO will be same as current in OB
Similarly current CO equal to current in OD
The given circuit can be redrawn as

R =4+4+114+18 =8 +12+18 =8 +83 =3231RAD =14 +18 +1323 =14 +18 +332 =8+4+332=1532RAD =3215Ohm

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