Question

Suppose there are signs on the doors to two rooms. The sign on the first door reads “In this

room there is a lady, and in the other one there is a tiger”; and the sign on the second door

reads “In one of these rooms, there is a lady and in one of them there is a tiger.” Suppose

that you know that one these signs is true, and the other is false. Behind which door is the

lady? Explain your reasoning using propositions.