The Resistance RAB in the circuit is—

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The Resistance R_AB in the circuit is—

1. 12 Ω
2. 10.8 Ω
3. 6.75 Ω
4. 9 Ω

Correct Option: D

First change the given star into delta

R_AB = 18 || (9 + 9) = 9 Ω