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The resistance between OA is given by

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$4 Ω$

$1 Ω$

$3 Ω$

$2 Ω$

answer is B.

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Detailed Solution

Using symmetric method, equivalent circuit becomes

The 1 ohm and 2 ohm resistances are in series,

Equivalent resistance will be 3 ohms.

This is in parallel with 6 ohm resistance,

Equivalent resistance will be 2 ohms.

This is in series with the 2 Ohm resistor on the left.

Their Equivalent is 4 ohms, which is in parallel with 4 ohm resistor between O and A.

The total equivalent resistance between O and A will be 2 Ohms.

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