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Requ =2R parallel R
=2R*R/(2R + R )
=2/3 R =2/3*3 =2
The three resistors are connected in delta connection(as triangle). By converting delta to star we get three1Ω resistors and hence the equivalent resistance between two sides becomes2Ω.
R =2Ω
1 / R =1/{(1/(3+3)) + (1/3))
R =2
2 ohm
2 OHM
The equivalent resistance is2 ohm