The efficiency of a Carnot engine working between two temperatures is \(\dfrac{1}{6}\). If on reducing the temperature of the sink by 65 K, the efficiency becomes \(\dfrac{1}{3}\), the temperatures of the source and the sink are
1
117°C, 52°C
2
2170°C, 52°C
3
152°C, 117°C
4
252°C, 117°C
5
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