Two batteries E₁ (emf :2V , internal resistance : 1?) and E₂ (emf: 4V, internal resistance : 2?) are connected in series by connecting positive terminal of E₂ with negative terminal of E_1. A third battery E₃(emf=3V, internal resistance : 6? ) is connected in parallel with this combination by connecting its positive terminal to the positive terminal of E₁ and its negative terminal to negative terminal of E_2.The equivalent emf and resistance of this combination will be?

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