19. Consider two Carnot engines connected in series. The efficiency for the first engine is ε₁ while the efficiency for the second engine is ε₂. What is the overall efficiency of the combined system?

(A) ε₁ + ε₂
(B) ε₁ε₂
(C) (ε₁ + ε₂)/2
(D)
(E) ε₁ + ε₂ − ε₁ε₂

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