If the resistors of star connected system are R1, R2, R3 then the resistance between 2 and 3 in delta connected system will be?

If the resistors of star connected system are R1, R2, R3 then the resistance between 2 and 3 in delta connected system will be? Correct Answer (R1R2 + R2R3 + R3R1)/R1

After transformation to delta, the resistance between 2 and 3 in delta connected system will be (R1R2 + R2R3 + R3R1)/R1 and this resistance lies between R3, R2 in delta connection.
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