In a prison house with three prisoners in three separate cells, the guards use colored lights to keep track when prisoners go in and out of their cells. The green light turns on only when both cell A and cell C are occupied. The red light is always on unless either cell A or cell B is un-occupied. Given that the green light is on, we can conclude all of the following EXCEPT-
A Cell A cannot be un-occupied
B The red light must be on
C Cell C cannot be un-occupied
D We don't have information to determine whether cell B is occupied or not
Solution
Correct Answer: Option B
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