Between A & B, we're considering the series conection between AD, DC and DB. SO that becomes 2+2+2 = 6 ohms. And THAT is connected in parallel to AB, so it becomes 1/6 + 1/2 = 2/3, reciprocal it. 3/2 = 1.5 ohms.
Between A and C, we consider the parallel connection between AD and BC, so that becomes 1/2 + 1/2 = 1 ohm AND the parallel connection between DC and AB which is also 1/2 + 1/2 = 1 ohm. 1+1= 2 ohms.
I think it is like that CORRECT ME IF I'M WRONG!
freyance
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