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In the following circuit, what is the resistance across \( A B \).
(1) \( \frac{8 r}{7} \)
(2) \( \frac{7 r}{8} \)
(3) \( \frac{3 r}{2} \)
(4) \( \frac{2 r}{3} \)
\( \mathrm{P} \)
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