Question

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Answer 1

Answer: 30 Ω

Explanation:

The following circuit connection can be rearranged as shown in the image attached.

Because B and C are not connceted and become open circuted

So from the new arragement.

Effective restistance is :

$10 + \frac{(10+10)\times(10+10)}{(10+10)+(10+10)} + 10 = 30 \Omega$

Hope this helps.