In a room air-conditioner, when the temperature reaches 28oC, the cooling is switched on. When the temperature
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In a room air-conditioner, when the temperature reaches 28oC, the cooling is switched on. When the temperature falls to below 20oC, the cooling is switched off. What is the minimum set of test input values (in degree centigrade) to cover all equivalence classes?
(a) 20, 22, 26
(b) 19, 22, 24
(c) 19, 24, 26
(d) 19, 24, 29
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