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Find the emf and internal resistance of the equivalent cell between A and B. Put \( \epsilon_{1}=6 \mathrm{~V}, r_{1}=2 \)
\( \mathrm{P} \) \( \Omega, \epsilon_{2}=4 \mathrm{~V}, r_{2}=2 \Omega \), and \( \epsilon_{3}=3 \mid \mathrm{V}, r_{3}=3 \Omega \),

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