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What does "Impossible" signify in formal logic?

Evidence
Necessity
Mutually Exclusive
Conclusion

The correct answer is: Mutually Exclusive

"Impossible" in formal logic signifies that two events or sets are mutually exclusive, meaning that they cannot occur at the same time. This is different from "evidence", which is used to support a claim or argument. "Necessity" can also be seen as incorrect because it suggests that something is required or needed, whereas "impossible" simply means that something cannot happen. Lastly, "conclusion" is not a correct answer because it refers to the outcome or result of an argument, rather than a logical relationship between two events or sets.